Question

Which equation is the result of combining the equations using subtraction?

Answer 1

D : -5x=8

`\left \{ {-4x+6y=13\\} \atop {-x+6y=5}} \right.`

by multiplying the 1st equation by - 1:

`\left \{ {-4x-6y=-13}\\ \atop {-x+6y=5}} \right.`

we obtain

-5x=-8

5x=8

Explanation: