Question 372373
-3/4x+y/3=5/12 
x/5-y=4/5
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Get rid of the fractions:
-9x+4y = 5
x - 5y = 4
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Solve the 2nd equation for "x":
x = 5y+4
Substitute and solve for "y":
-9(5y+4) + 4y = 5
-45y-36 +4y = 5
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-41y = 41
y = -1
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Substitute into x = 5y+4 to solve for "x":
x = 5(-1)+4
x = -1
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Cheers,
Stan H.