Jesse K. answered • 10/11/16

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Cost of computer game = $x

Prarie has $y at first

At first, Prarie had 10% more than the cost of a computer game

y=x +10%x

y =x+0.1x

y=1.1 x equation 1

After Prarie spent $7.50,

She has =y-7.50 which is 15% less than the cost of the computer game

y-7.50 = x - 15% of x

y-7.5 =x-0.15x

y= x-0.15x+7.5

y=0.85x +7.5 equation 2

from equation 1 and 2

1.1x = 0.85x +7.5

0.15x =7.5

x = 50

substitute x=50 in eq 1

y=1.1x

y=1.1(50)

y= 55

Cost of computer game = $x = $50

Prarie has $y at first=$55

Prarie has $y at first=$55