Math

Solve for 5x - y = - 18 and - x + 4y = 15

Asked by AnneS2 on 14 Jul 04:24

Last updated by anonymous on 16 Jul 11:10

1 Answers

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Answered by CherieS on 16 Jul 11:10

5x - y = - 18

5x - y +y= - 18+y

5x=-18+y

5x+18=-18+y+18

y=5x+18

- x + 4y = 15

- x + 4(5x+18) = 15

- x + 4(5x) (4)(+18) = 15

-x+20x+72=15

19x+72=15

19x+72-72=15-72

19x=-57

19x/19=-57/19

x=-3

y=5x+18

y=5(-3)+18

y=-15+18=3