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Question

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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Optional Information

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)

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Expert: abozer
Pos. Feedback: 99.9 %
Accepts: 
Answered: 3/1/2009

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