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<p>Diagram^</p>
<p>In the figure above k is perpendicular to p and m is parallel to p. what is y in terms of x?</p>
<p>x is under line M. The angle on the OTHER side of line M (on the right) is 180 minus x since it is supplementary to x (both angles add up to 180 degrees).
The angle on the right of y is equal to the same thing, 180 - x, because it is in the same position in relation to the diagonal line and one of the parallel lines, P. So the degree of y is 90 - (180-x) since both angles are complementary. </p>
<p>y=90-(180-x)=x-90</p>