Idiot\'s Guides Basic Math and Pre-Algebra

Chapter 11: Coordinate Graphing 137

To graph the equation 3x + 2y = 6, make a table with a few possible values of x.

x 3 x + 2y = 6 y (x,y)

-2 3(-2)+ 2y = 6

-6 + 2y = 6

2 y = 12

y = 6

6(-2,6)

-1 3(-1) + 2y = 6

-3 + 2y = 6

2 y = 9

y = 4.5

4.5 (-1,4.5)

0 3(0) + 2y = 6

0 + 2y = 6

2 y = 6

y = 3

3(0,3)

1 3(1) + 2y = 6

3 + 2y = 6

2 y = 3

y = 1.5

1.5 (1,1.5)

2 3(2) + 2y = 6

6 + 2y = 6

2 y = 0

y = 0

0(2,0)

Once you’ve built your table, plot each of your points. You should see them falling into a line. If a
point doesn’t fall in line, check your arithmetic.