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8090 [49]
3 years ago
9

Solve the system by substitution. x=9y x-5y=20

Mathematics
2 answers:
vodomira [7]3 years ago
5 0

Answer:

x-5=20

9y-5y=20

4y=20

4y÷4=20÷4

y=5

x=9y

x=9×5

x=45

SIZIF [17.4K]3 years ago
4 0
X=9y
9y-5y=20
4y=20
Therefore y=5
Substitute y=5 into eqn 1
X=9*5
X=45
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