Question 503725: Solve using elimination or substitution 4x-7y =-16;6x+3y = 30?
Answer by oberobic(2304)   (Show Source):
You can put this solution on YOUR website! 4x -7y = -16
6x +3y = 30
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Multiply the first equation by 3 and the second equation by 2, then subtract to eliminate the 'x' terms.
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12x -21y = -48
12x +6y = 60
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-27y = -108
y = 4
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substitute y=4 into first equation
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4x -7(4) = -16
4x = -16 +28
4x = 12
x = 3
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Always check your work.
Substitute these values in the second equation.
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6x +3y = 30
6(3) = 18
3(4) = 12
18+12 = 30
Correct.
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Answer: x=3, y=4
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Done.
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