Question

What number could replace the box so that the system of equations has infinitely many solutions? 3x + 4y = 5 DX-12y = -15 O A. 3 O B. 9 C. -3 O D. -9

Answer 1

-9

3x+4y=5

-9x-12y=-15

Multiply the first equation by 3 and add both

9x+12y=15

+

-9x-12y=-15

__________

0 = 0

Infinite many solutions