# Straight Line Graphs y = mx + c - PowerPoint PPT Presentation

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Straight Line Graphs y = mx + c. LESSON AIM : To understand and use y = mx + c to draw and interpret straight line graphs. a - d. 2c + 4a. 3c - d. 2d - c. -3c + a. 5b - a. 3b + d. 2a + d. 6b + 4c. 4a - c. y. 5. 4. 3. 2. STARTER. 1. 0. x. -5. -4. -3. -2. -1. 1. 2.

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Straight Line Graphs y = mx + c

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Straight Line Graphs

y = mx + c

LESSON AIM:

To understand and use y = mx + c to draw and interpret straight line graphs.

a - d

2c + 4a

3c - d

2d - c

-3c + a

5b - a

3b + d

2a + d

6b + 4c

4a - c

y

5

4

3

2

STARTER

1

0

x

-5

-4

-3

-2

-1

1

2

3

4

5

-1

-2

-3

-4

-5

a = -2

b = 3

c = -1

d = 4

y = mx + c

What does the m represent?

INVESTIGATE!

y = mx + c

What does the c represent?

INVESTIGATE!

The general equation of a straight line is given in the form:

y = mx + c

The Y-INTERCEPT, where the line crosses the y-axis.

PLENARY

TRUE

TRUE

FALSE

or

?

The equation y = mx + c

applies to

straight line graphs only

TRUE

TRUE

FALSE

or

?

In y = mx + c, x and y

stand for the coordinates

of the points on the line

TRUE

TRUE

FALSE

or

?

m stands for the

the line

FALSE

TRUE

FALSE

or

?

c gives the point

where the line cuts

the x-axis

FALSE

TRUE

FALSE

or

?

To get the equation for a

line sloping in the

opposite direction to

y = mx + c, c changes sign

TRUE

TRUE

FALSE

or

?

When c is zero, the line

goes through

the origin (0,0)

FALSE

TRUE

FALSE

or

?

the steeper the line

FALSE

TRUE

FALSE

or

?

If a line goes through the

of 2 the equation of the

line is y = x + 2