math
posted by patty .
If (8, 7) are the coordinates of a point on a line that has slope –3, what is the ycoordinate of the point on the line at which x=1

first find the equation:
with slope of 3 and the point(8,7) on it, using
y = mx + b
7 = 3(8) + b
31
y = 3x + 31
when x = 1
y = 3(1) + 31 = 28