book Maths Puzzle Numerical Ability

what is the soultion to this simultaneous equation using substion or addtion method
x+2y=15
x-2y=-9

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book Other Question

Find the value of x in the equation
The square root of x+5=the square root of x+45?
A reflecting telescope has a parabolic mirror for which the distance from the vertex to the focus is 35feet. if the distance across the top of the mirror is 54inches, how deep is t