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24 February, 20:28

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

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Answers (1)
  1. 24 February, 23:53
    0
    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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