solve using elimination
9x-4y=20
7x-3y=20
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9x-4y=20
7x-3y=20
-. +. -
___________
2x - y = 0
y= 2x-0
y=2x
9x-4×2x=20
9X-8x=20
x=20
y=2×20
y=40
hope it helps you..!
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