Math

Solve for both systems 5z + y = 81 and 9z+y=145

Asked by AnneS2 on 20 Aug 12:21

Last updated by anonymous on 22 Aug 13:26

1 Answers

Log in to answer

Answered by CherieS on 22 Aug 13:26

5z + y = 81

5z -5z+ y = 81-5z

y = 81-5z

9z+y=145

9z+81-5z=145

4z+81=145

4z+81-81=145-81

4z=64

4z/4=64/4

z=16

y = 81-5z

y = 81-5(16)

y = 81-80=1