Question

Value of x. 3x+7y=31, -3x-2y=-1

Answer 1

Answer: -11/3

Explanation:

Adding the two equations, we get
`5y=30 \implies y=6`

Substituting this into the first equation,

`3x+7(6)=31\\\\3x+42=31\\\\3x=-11\\\\x=\boxed{-(11)/(3)}`