How do you solve the system of equations $5x + y = 9$ and $- 10x + 7y = 18$ ?

Question

1504 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-06-08T20:17:42

$x=1,y=4$

Multiplying the first equation by $2$ and adding to the second:
$9y=36$ so $y=4$
plugging this in the first equation:
$5x+4=9$ so $x=1$

How do you solve the system of equations 5x + y = 95x + y = 9 and - 10x + 7y = 18- 10x + 7y = 18?