Luke earned $54 for 3 lawns
So each lawn = $54/3 = $18
After mowing 7 lawns =
7 X $18 = $126
The slope intercept form using the two points would be : y= 2x-13
-3x4.5=13.5. 4.5x0.5=2.25
-13.50
+2.25
_____
15.75 pints
Cross multiply to get 8k+24=56 then solve for k so subtract 24 from each side to get 8k=32 so k=4
