For $5.00 you could buy 1 coke and 3 pieces of pizza. for $8.00 you could
buy 3 cokes and 2 pieces of pizza . write the systems of equations to
represent the situation.

answer:

step-by-step explanation:

hi there!

coke x

one piece of pizza y

x+ 3y = 5

3x + 2y = 8

-3. (x+ 3y) = -15   =

-3x+ - 9y = -15

  3x+2y = 8

-3x +-9y = -15

+  

-7y     = -7

y=1

x=2

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15

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