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Solve this system of equations by substitution: 4x-5y=30 y=2x-12 (please show steps to your answer)
Submitted: 266 days and 22 hours ago.
Category: Math
Value: $9
Status: CLOSED
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Level: college; Subject: algebra
Accepted Answer
Hi,
4x - 5y = 30
y = 2x - 12
Substitude the second equation in the first one,
4x - 5(2x - 12) = 30
Solve for x,
4x - 10x + 60 = 30
-6x = -30
x = 5
Now plug this in the second equation to get y,
y = 2(5) - 12
y = -2
So the solution is x = 5, y = -2
or in ordered pair notation:
(5, -2)
Expert:
abozer
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Answered:
3/1/2009
Math Answer Team
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