Which system of linear equations has no solution? A)5x + 2y=-8
-5x + 2y = 8
B)-5x+ 2y=-8
-5/2x+y=-4
C)- 5x + 2y=8
25x - 10y = 40
D)-5x + 2y= -8
5x + 2y = 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