Determine whether each equation represents a direct variation. if it does, find the constant of variation 4x + 6y =3

In angle pqr find the measure of

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

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