How many solutions does the equation have y=1/2x-7 y=6x+2

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.