Move -4 to the other side
7x=24+4
7x=28
x=4
The slope is 1/2 and the Y intercept is -3, so the equation will be Y=1/2x-3
9.82-9.71=.11
.11x100 divided by 9.82 = 1.12%
Mrs. Smith donated $20
The constant proportionality is $1 because no matter what, Mrs. smith will donate $1 for each mile. So if Sam were to only walk 1 mile, mrs. smith would donate $1. Or seen as a 1:1 proportion.