9.2 Representing Linear Functions

Graphing Equations Make a Table

Making a Table 1.Solve the equation for y 2.Pick your x values (-1, 0,1, 2) 3.Plug in the x values into x in the equation to find the corresponding y values 4.Plot the (x, y) ordered pairs on the coordinate plane

Solve for ‘y’ Solve for ‘y’ means “get y all by itself”

x y Find 4 solutions y = 2x + 1 X ValuesY=2x + 1 Y Values(x,y) 1 0 2(1) +1 3(1,3) 2(0) +1 1(0,1) 2(-1) +1 (-1,-1) 2 2(2) +1 5(2,5)

x Graph: Y=-3x x y(x,y) (2) -3(1) -3(0) -3(-1) (2,-6) (1,-3) (0,0) (-1,3)

x y Graph: -2x + y = 5 y = 2x + 5 xY=2x+5y(x,y) 1 0 2(1) +5 7(1,7) 2(0) +55(0,5) 2(-1)+5 3 (-1,3) 2 2(2) +5 9 (2,9)

Assignment: Page 393 (13-24) all -