Answer:
[tex]-\frac{21}{2}[/tex]
Step-by-step 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:
[tex](3-y)+(3-y) = 6+21[/tex]
Ordering and solving both sides:
[tex]6-2y=27\\-2y=27-6\\y=\frac{21}{-2}[/tex]
Hence, the value to the system is [tex]-\frac{21}{2}[/tex]
It's important to combine both equation, because the exercise is asking for the solution of the system.
