Question

How do you solve 4x+2y=10 x-y=13 using substitution

Answer 1

`\left \{ {{4x+2y=10} \atop {x-y=13}} \right.`

`x=13+y`

`4(13+y)+2y=10`

`52+4y+2y=10`

`6y=-42`

`y=-(42)/(6)=-7`

`y=-7`

`x=13-7=6`

`\left \{ {{x=6} \atop {y=-7}} \right.`