Question

Solve:
3x-5y=17
9x-15y=-4

Answer 1

multiply the first equation times 3, and tell me what you think about it.

Answer 2

I got 9x-15y=51

Answer 3

yes.
So in the second equation the "9x-15y" is -4, and in the second equation it is 51.

Answer 4

Wouldn't you multiply the second equation by -1? since you have to have opposite coefficients.

Answer 5

9x-15y=51
9x-15y=-4

see that the "9x-15y" is equal to different numbers?

Answer 6

in first equation it is 51, and in a second equation it is -4.

Answer 7

Therefore there are no solutions because 51 is not equal to -4.

Answer 8

ok thanks