Question

Three slices of cheese pizza and four slices of pepperoni pizza cost $12.50. Twoslices of cheese pizza and one slice of pepperoni pizza cost $5.00. What is the priceof one slice of pepperoni pizza?

Answer 1

Price of one slice = ?

Then write

3X + 4Y = 12.50

2X + 1Y = 5.00

Then now find Y

Multiply by 4, and substract 2X + Y = 5

4• ( 2X + Y ) = 4• 5.00

8X + 4Y = 20

now substract 3X + 4Y = 12.5

(8X + 4Y)- ( 3X + 4Y) = 20 - 12.5

(8X - 3X )+ 4Y - 4Y = 7.5

5X + 0 = 7.5

. X = 7.5/5 = 1+ 1/2 = 1.5

Then ANSWER IS

Price of 1 slice of pepperoni = $1.5 dollars