Can this linear system be solved by subtracting one of the original equations from the other? why or why not

Figure abcd is a parallelogram. if point c lies on the line x = 2, what is the y-value of point c

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

Identify the parent function that can be used to graph the function f(x)=3(x-9)2