exam Maths Puzzle Numerical Ability

Solve the system by addition or substitution.
-4x + 2y = -12
y = 2x - 7

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exam Other Question

when a sound travels through water, the distance y in meters that the sound travels in x seconds is given by the wquation y=1440x.

How far does a soun travel underwater in 5 sec The sides of a rectangle have lengths x+9 and widths x-3.Which equation describes the perimeter,P,of the rectangle in terms of x?
a.P=x^2 +6x-27
b.P=4x+12
c.P=x^2+12x-27
d.P=2x+6