without finding the value of x and y find xy for following equation: 5x+6y=13. 6x+5y=20.
also find, x²-y²,1/x+1/y,
x²+y²,1/x-1/y
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Answer:
5x×5=25x;6y×5=30y;13×5=65;6x×6=36x;5y×6=30y;20×6=120
Step-by-step explanation:
1.25x+30y=65minus 36x+30y=120 2.11x=55 3. x=55÷11=5 4. 5×5+6y=65 5. 6y=65-25=40 6. 6y=40 or y=40÷6=?
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