book Maths Puzzle Numerical Ability

Please Help Me Again!!Thanks For The Other Help,too!
5x=4y-7
4x=5y-2
thank you!!!!!!!!!!

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book Other Question

Any help with this problem would be greatly appreciated

Rationalize the denominator:
2____
√[6] - √[5]

Thanks what would be the coordinate for y=-4x+2 on a coordinate grid