The pie and ice cream together have 500 calories. How many calories are in each?
————- Equations: Quantity Equation: p + i = 500 Quantity Equation: p = 3i -20 ————————————- Substitute for “p” and solve for “i”: 3i-20 + i = 500 4i = 520 i = 130 (# of calories in ice cream) ——————————— Since p+i = 500, p = 500-130 = 370 (# of calories in a piece of pie) ======================================================================= Cheers, Stan H.