18. Find a general solution of the differential equation 9% = 2x + 5r de a. y = 2x + 5x+ C b. y = 4x +5 +C GYE 2 C d. y = C 2 19. Use integration to find a general solution of "2 = 13x cos(Bx]) a. y = 13 4 "sin(16x]) + C by = 13 x cos(8x] ) + C 16 13 sin(8x ) + C 16 d. y= 13 cos(8x]) + C 16 20. Select from the choices below the slope field for the differential equation % = 2six. none of these C