3x-4y=16 and xy=4 find 9 x square +16 y square
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352 is the correct answer
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mathupto12:
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3x-4y=16,
xy=4
x=4/y
put in equation
3×4/y-4y=16
12/y-4y=16
12/y=16+4y
12=y{16+4y}
12=16y+4y^2
divide by 4
3=4+y^2
-4+3=y^2
-1=y^2
y=1
xy=4
x=4/y
put in equation
3×4/y-4y=16
12/y-4y=16
12/y=16+4y
12=y{16+4y}
12=16y+4y^2
divide by 4
3=4+y^2
-4+3=y^2
-1=y^2
y=1
put y in equation you will get answer
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