Question 719830
solve this equation with substitution 
-5x - 7y = -15
x + 2y = 6
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Modify then substitute:
x = 6-2y
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-5(6-2y)-7y = -15
-30 + 10y - 7y = -15
3y = 15
y = 5
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Solve for "x":
x = 6-2y
x = 6-2*5
x = -4
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Cheers,
Stan H.
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