SOLUTION: Solve the system of equations using the substitution method. y=3x+1, 3y-7x=9

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Question 511319: Solve the system of equations using the substitution method. y=3x+1, 3y-7x=9
Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
y=3x+1.
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substitute for y
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3(3x+1) -7x = 9
9x +3 -7x = 9
2x = 6
x = 3
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substitute for x
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y =3(3) +1
y = 10
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check using 3y-7x = 9
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3y -7x = ??
3(10) -7(3) = 30 -21 = 9
correct
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Answer: x=3, y=10
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Done.