Question

How do you solve `3x+y=21` and `x+y=1`?

Answer 1

`x=10; y= -9`

Explanation:

`3x + y =21` (1)
`x + y = 1` (2)
Subtracting (2) from (1) we get `2x =20 or x = 10` `andy= 1-10 =-9 [Answer]`