Question

solve 4/x+5/y=7 3/x+4/y=5

Answer 1

Step-by-step explanation:

4/x+5/y-7=0 equation 1

3/x+4/y-5=0 equation 2

eqn(1)×3 12/x+15/y-21=0

eqn (2)×4 12/x+16/y-20=0

subtract eqn2 from eqn1

-1/y-1=0

-1/y=1

y=-1

put the value of y in to eqn 1

4/x+5/y-7=0

4/x+(5/-1)-7=0

4/x-5-7=0

4/x-12=0

4/x=12

12x=4

x=4/12=1/3

x=1/3,y=-1 (ans)

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