Question

The solution to the system x + 2y = 7 is....
2x - 4y = 6
A. no solution
B. (5, 1)
C. infinite # of solutions
D. (3,4)

Answer 1

i believe the answer is B because if you multiply x+2y=7 by -2 you get (-2x-4y=-14) and then you add that to the other equation and get -8y=-8 and so divide that by -8 and you get y=1 then plug y into one of the equations and get 5