How do you solve 1.8x+3y=3 and -2x-2.5y=-5?

Jun 21, 2018

$x = 5 , y = - 2$

Explanation:

Fro the second equation we get

$- 2 x = - 5 + \frac{5}{2} y$
$x = \frac{5}{2} - \frac{5}{4} y$
plugging this in the first equation we get

$\frac{9}{5} \left(\frac{5}{2} - \frac{5}{4} y\right) + 3 y = 3$
$\frac{9}{2} - \frac{9}{4} y + 3 y = 3$
from here we get

$y = - 2$
so
$x = 5$