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23 February, 05:13

8z-13=7 what's the number that replaces z

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Answers (2)
  1. 23 February, 05:34
    0
    All you do is solve for z. So 8z-13=7. To solve for a variable you have to do the opposite to cancel out the numbers on each side. First you add 13 over to 7 to cancel out 13 on the z side. So 8z=20 is what you have left. Then you divide 8 on both sides to cancel out 8 on the z side. what you are left with is z=2.5. Lastly you plug and check. 8 (2.5) - 13 = 7, 20-13=7. And thats correct so z is 2.5.
  2. 23 February, 05:37
    0
    8z-13=7 (first, add 13 to both sides)

    8z=20

    z=20/8

    =10/4

    =5/2

    =2.5
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