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Lesson Menu

Main Idea and New Vocabulary

NGSSS

Example 1: Find Slopes and y-intercepts

Example 2: Find Slopes and y-intercepts

Example 3: Write an Equation in Slope-Intercept Form

Example 4: Write an Equation in Slope-Intercept Form

Example 5: Graph Using Slope-Intercept Form

Example 6: Graph an Equation to Solve Problems

Example 7: Graph an Equation to Solve Problems

Five-Minute Check

- Graph linear equations using the slope and y-intercept.

- slope-intercept form
- y-intercept

MA.8.A.1.2 Interpret the slope and the x- and y-intercepts when graphing a linear equation for a real-world problem.

NGSSSState the slope and y-intercept of the graph of y = x – 5.

Write the equation in the form y = mx + b.

Answer: The slope of the graph is , and the y-intercept is −5.

Find Slopes and y-intercepts

Example 1State the slope and y-intercept of the graph of .

A.slope: ; y-intercept: 1

B.slope: ; y-intercept: 1

C.slope: 1; y-intercept:

D.slope: 1; y-intercept:

Example 1 CYPFind Slopes and y-intercepts

State the slope and y-intercept of the graph of 2x + y = 8.

2x + y = 8 Write the original equation.

2x –2x+ y = 8 – 2xSubtract 2x from each side.

y = 8 − 2x Simplify.

y = −2x + 8Write the equation in the form y = mx + b.

y = mx + bm = –2, b = 8

Answer: The slope of the graph is –2 and the y-intercept is 8.

Example 2State the slope and y-intercept of the graph of y – 4x = 10.

A. slope: –4; y-intercept: 10

B. slope: 4; y-intercept: 10

C. slope: 10; y-intercept: –4

D. slope: 10; y-intercept: 4

Example 2 CYPWrite an Equation in Slope-Intercept Form

Write an equation of a line in slope-intercept form with a slope of 2 and a y-intercept of –8.

y = mx + bSlope-intercept form

y = 2x +(–8)Replace m with 2 and b with –8.

y = 2x – 8Simplify.

Answer: y = 2x – 8

Example 3Write an equation of a line in slope-intercept form with a slope of – and a y-intercept of 6.

A.y = – x – 6

B.y = – x + 6

C.y = x + 6

D.y = 6x –

Example 3 CYPSo, the slope is – . slope of

Write an Equation in Slope-Intercept Form

Write an equation in slope-intercept form for the graph shown.

The y-intercept is 1. From (0, 1), you move up 2 units and left 3 units to another point on the line.

Example 4y slope of = –x + 1Replace m with – and b with 1.

y = – x + 1

Answer: y = – x + 1

Write an Equation in Slope-Intercept Form

y = mx + bSlope-intercept form

Example 4A. slope of y = –3x – 2

B.y = 3x – 2

C.y = – x – 1

D.y = x – 1

Write an equation in slope-intercept form for the graph shown.

Example 4 CYPGraph using the slope and slope of y-intercept.

y = x + 2 slope = , y-intercept = 2

Graph Using Slope-Intercept Form

Step 1Find the slope and y-intercept.

Example 5← slope of change in y: up 2 units←change in x: right 3 units

m =

Graph Using Slope-Intercept Form

Step 3Use the slope to locate a second point on the line.

Example 5Graph Using Slope-Intercept Form slope of

Step 4Draw a line through the two points.

Answer:

Example 5Graph an Equation to Solve Problems slope of

KAYAK RENTAL A kayak rental pavilion charges $15.00 per hour and $2.50 for instruction on how to not fall out of the kayak. The total cost is given by the equation y = 15x + 2.5, where x is the number of hours the kayak is rented. Graph the equation to find the total cost for 2 hours.

y = 15x + 2.5 slope = 15, y-intercept = 2.5

Example 6Graph an Equation to Solve Problems slope of

Plot the point (0, 2.5).

Locate another point up 15 and right 1.

Draw the line.

The y-coordinate is 32.5 when the x-coordinate is 2, so the total cost for 2 hours is $32.50.

Answer: The total cost for 2 hours is $32.50.

Example 6POTTERY slope of A pottery studio charges $16 per hour and $10 for firing fees. The total cost is given by the equation y = 16x + 10, where x is the number of hours a customer uses the studio. Graph the equation to find the total cost for 5 hours.

A.$26

B.$80

C. $90

D.$100

Example 6 CYPGraph an Equation to Solve Problems slope of

KAYAK RENTAL A kayak rental pavilion charges $15.00 per hour and $2.50 for instruction on how to not fall out of the kayak. The total cost is given by the equation y = 15x + 2.5, where x is the number of hours the kayak is rented. Interpret the slope and the y-intercept.

Example 7Graph an Equation to Solve Problems slope of

Answer: The slope 15 represents the rate of change or cost per hour. The y-intercept 2.5 is the charge for instruction.

Example 7POTTERY slope of A pottery studio charges $16 per hour and $10 for firing fees. The total cost is given by the equation y = 16x + 10, where x is the number of hours a customer uses the studio. Interpret the slope and the y-intercept.

A.The slope 10 represents the firing fee. The y-intercept 16 is the cost per hour.

B.The slope 10 represents the cost per hour. The y-intercept 16 is the firing fee.

C.The slope 16 represents the firing fee. The y-intercept 10 is the cost per hour.

D.The slope 16 represents the cost per hour. The y-intercept 10 is the firing fee.

Example 7 CYPA. slope of m = ; b = 1

B.m = 1; b = 2

C.m = 2; b = –

D.m = 2; b = 1

State the slope and the y-intercept for the graph of the equation y = 2x + 1.

Five Minute Check 1State the slope and the slope of y-intercept for the graph of the equation y = 3x + 2.

A.m = –2; b = 3

B.m = 2; b = 3

C.m = 3; b = –2

D.m = 3; b = 2

Five Minute Check 2State the slope and the slope of y-intercept for the graph of the equation y = −2x + 4.5.

A.m = −4.5; b = –2

B.m = −2; b = 4.5

C.m = 2; b = 4.5

D.m = 4.5; b = –2

Five Minute Check 3State the slope and the slope of y-intercept for the graph of the equation 3x − y = 4.

A.m = 3; b = −4

B.m = –3; b = −4

C.m = 3; b = 4

D.m = −4; b = 3

Five Minute Check 4The total price of apples slope of y at an orchard can be calculated with the equation 1.12x + 5 = y, where x is the number of pounds of apples picked. What does the slope represent?

A.the total price of apples

B.the price of apples per pound

C.the number of apples per pound

D.the number of pounds of apples picked

Five Minute Check 5A. slope of y = 2x –

B.y = x + 2

C.y = x − 2

D.y = x – 2

What is the equation of the graph?

Five Minute Check 6
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