exam Maths Puzzle Numerical Ability

please help i have 2 problems im stuck on
the first
7x-5y=-15
and the second
6y+5x=-6

both use y=mx+b
thanks

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exam Other Question

What is the transformational form of the quadratic function described by the mapping rule (x,y)> (x+2,3/4y-3)?
I said 4/3y+3=(x-2)^2 but I was marked wrong:( what is 2x-3y=9