math 6 algebra

Mikayla wrote the equation below to calculate y, the total amount of money in dollars she will have saved after she has been saving for x weeks. y = 6x + 80 How much more money will Mikayla have saved after 8 weeks compared to 5 weeks?

$8
$18
$98
$128
How do i do this?

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asked by moby
  1. Write two equations. Substitute 5 for x in one equation. Substitute 8 for x in the other equation.

  2. what is 6 times 8 minus 80
    what is 6 times 5 minus 80

    subtract the second amount from the first, I get

    6(8-5)

  3. Ok so will it look like this then?

    y = 30 + 80
    y= 48 + 80

    And the answer would be $18?

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    posted by moby
  4. correct answer.

  5. Yeah!!:))))) Thanks guys!

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    posted by moby

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