SOLUTION: solve using the substitution method 5x+3y=80 2x+y=30

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Question 930348: solve using the substitution method
5x+3y=80
2x+y=30
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
From eq. 2,
y=-2x%2B30
Substitute into eq. 1,
5x%2B3%28-2x%2B30%29=80
5x-6x%2B90=80
-x=-10
x=10
Then,
y=-2%2810%29%2B30
y=-20%2B30
y=10