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How do you do this geometry problem

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?