Question

Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.

Solve the system of equations

3-y=6

3-y = 21

Answer 1

`-(21)/(2)`

Explanation:

We can solve this system just by summing each side of the equation:

So, both left sides will be sum, and both right sides too.

The resulting expression will be:

`(3-y)+(3-y) = 6+21`

Ordering and solving both sides:

`6-2y=27\\-2y=27-6\\y=(21)/(-2)`

Hence, the value to the system is
`-(21)/(2)`

It's important to combine both equation, because the exercise is asking for the solution of the system.