Question

Solve using any appropriate method.

2s-13t=120
-14s+91t=-840

Answer 1

try multiplying the first equation by -7.... what do you notice?

Answer 2

i get -14 and -91

Answer 3

if you multiply the 1st equation by -7 you get
-14s + 91t= -840

this matches the 2nd equation, so you have an infinite number of solutions.

Answer 4

any (s,t) pair that works in the 1st equation works in the 2nd equation... an infinite number of solutions.