turn that equation into y = mx + b.
2y = -3x + 12
y =
the
is the slope and the 6 is the y-intercept
to graph it draw a point on the y intercept so (0,6) and draw some more points while going down the slope. you read the top number, thats the y, and bottom number is x. so you go 3 points down and 2 points to the right, and draw a line between thsoe points