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## Warm Up #20

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**Warm Up #20**1.) Graph 5x + 7y =35 2.) Graph 2x -3**Graph 5x + 7y =35**Solve for “y” 7y = -5x +35 Y = -5/7 x + 5**Find 3 points using the table, and graph the line of the**equation.y = 2x - 3 1 -1 0 -3 -5 -1**7.3 Linear Equations and Their Graphs**Objective: • To graph linear equations using the x and y intercepts • To graph horizontal and vertical lines**Linear Equations(Graphs are straight lines)**• Equation is linear only if the each variable has an exponent of “1”. • (exponent in denominator is not linear) • Products of variables not linear, ie (x)(y) y – 3x = -7 y = 2x + 1 y = x2 + 1 5y = 14 xy = 2**y**x - intercept X y - intercept**Graphing using Intercepts**Let x=0 and determine the y-intercept. Let y=0 and determine the x-intercept Plot both points. Connect them with a line.**Graph 4x + 3y = 12 using intercepts**Find x-intercept 4x + 3(0) = 12 Find y-intercept 4(0) + 3y = 12 4x = 12 3y = 12 x = 3 y = 4**Horizontal and Vertical Lines**• The graph of y= # is HORIZONTAL • The graph x =# is VERTICAL**Differences between graphing by using a table and graphing**by finding the x and y intercepts • When graphing by a table you need to solve for y (Slope Intercept Form y=mx+b) • When graphing by finding the x and y intercepts you do not have to solve for y (Standard Form Ax +By =C)