1.50x=y is the equation. He gets 1.50 for every cup so it's 1.50 times the amount of cups he sells
The slope is 4/3 because rise over run (if u have heard of that expression)
You take the amount paid and divide it by the amount of cheese. So 10.50 divided by 2.5 equals 4.2 and 12.60 divided by 3 equals 4.2 meaning that one pound of cheese costs $4.20
1 switch sides
(x-4)=0
add four to both sides
x-4+4 = 0+4
simplify
x = 4
