Three ratios equivalent to 4:3

Through: (-3,-3) parallel to y= 7/3x+3

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

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)