book Maths Puzzle Numerical Ability

please solve for x and y
y=-2x+6
y=x

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book Other Question

Moms age is Dads age reversed. Dad is older than mom. Dads and moms age are equal to 11 times the difference between moms and dads age.

This is what I have so far...

M+D = y=e^10^2x
x=?