4/x+3/y=1;8/x - 9/y=7
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Answer:y=-3 x=2
Step-by-step explanation:
(4y+3x)/xy=1
3x+4y=xy-(1)
(8y-9x)/xy=7
-9x+8y=7xy-(2)
(1)×2
6x+8y=2xy-(3)
(3)-(2)
15x=-5xy
y=15/-5
y=-3
4/x+3/y=1
4/x-1=1
4/x=2
4=2x
x=4/2
x=3
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