Please tell me please

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Graph the equationy=x^2 -[tex]y = x^{2} - 2[/tex]

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b