Math

Solve for both systems 5z+x=30 and 9z+7x=80

Asked by AnneS2 on 22 Jul 05:00

Last updated by anonymous on 24 Jul 11:36

1 Answers

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Answered by CherieS on 24 Jul 11:36

5z+x=30

5z-5z+x=30-5z

x=30-5z

9z+7x=80

9z+7(30-5z)=80

9z+7(30) (7)(-5z)=80

9z+210-35z=80

210-26z=80

210-26z-210=80-210

-26z=-130

-26z/-26=-130/-26

z=5

x=30-5z

x=30-5(5)

x=30-25=5