Question

How do u solve x-y=3
6x+4y=13

Answer 1

x - y = 3
6x + 4y = 13

x = y + 3

6(y + 3) + 4y = 13
6y + 18 + 4y = 13
10y = 13 - 18
10y = - 5
y = - 5/10
y = - 1/2

x = - 1/2 + 3
x = - 1/2 + 6/2
x = 5/2

Answer 2

$\left \{ {{x-y=3\ \ \ |\cdot4} \atop {6x+4y=13}} \right. \\\\ \left \{ {{4x-4y=12} \atop {6x+4y=13}} \right. \\+-----\\\\10x=25\ \ \ |:10\\x=2.5\\\\2.5-y=3\\2.5-3=y\\y=-0.5\\\\ \left \{ {{y=-0.5} \atop {x=2.5}} \right.$