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Lucy and Barbara began savings money the same week. The table below shows the models for the amount of money Lucy and Barbara had saved after x weeks.
Lucy's savings f(x)=10x+5
Barbara's savings g(x)=7.5x+25
after how many weeks will Lucy and Barbara have the same amount of money saved?
a)1.1 weeks
b)1.7 weeks
c)8 weeks
d)12 weeks

Respuesta :

You just put the answers into the equation so a) 10x1.1 + 5 = 16
7.5x1.1 + 25 = 33.25

b) 10x1.7 + 5 = 22
7.5x1.7 +25 = 37. 75

c) 10x8 + 5 = 85
7.5x8 + 25 = 85

In c ^ they both have the same amount of money (85) so the answer is c

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