5x+3y=12;2x-3y=12 by substitution method
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Answer:
5x+3y=12
5x=12-3y
x=12-3y/5
2x-3y=12
2(12-3y/5)-3y=12
24-6y-15y=60
-21y=36
y=-36/21
=-12/7
∴ x=22/7
y=-12/7
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