When solving the system 3}: + 4y = 13 5y-x=-21 using the addition method, what is the best course of action? Select one: on. Multiply the second equation by 4 and then add the equations. OB. Multiply the second equation by -5 and then add the equations. OC. Multiply the second equation by 3 and then add the equations. OD. Multiply the second equation by -3 and then add the equations. Question 'I'J Not yet answered Points out of 2.00 '0"? Flag question When solving the system 3): + 4y = 13 5y-x=-21 using the substitution method, what is the best course of action? Select one: 0A. Solve the second equation for x and then substitute it into the rst equation. OB. Solve the first equation for x and then substitute it into the second equation. OC. Solve the second equation fory and then substitute it into the first equation. OD. Solve the first equation for y and then substitute it into the second equation. Solve the system 3x + 4y = -13 5y - x = -21 by the method of your choice. Select one: OA. (-97/23, -2/23) OB. (-1, -4) OC. (1, -4) OD. (-4, 1) Question 19 Not yet answered Points out of 2.00 P Flag question Solve the system 4x - 2y = 10 y = 2x + 3 by the method of your choice. Select one: OA. (2, -1) OB. (2, 1) OC. Infinitely many solution OD. No solution