Answer:
a would equal -6
Step-by-step explanation:
First, use y=mx+b to find the y-intercept (plug in (x,y) and 1/2 for m)
-2=4(1/2)+b this would simplify to -2=2+b
Subtract 2 from both sides
-2-2=2-2+b
b=-4 our y-intercept is -4
our new equation would be y=1/2x-4, graph this equation and find a point that correlates with the -4 on the y-axis and is in the line, that point will be -6
To prove our point we can write the equation using our new points (-4,-6) and we will get -4 as our "b" or y-intercept
-6=-4(1/2)+b
-6=-2+b add -2 to both sides
-4=b
