X-y=10. 3x+y=18

Question

Use elimination for this problem

Answer 1

x - y = 10----(1)

3x +y =18----(2)

If you are trying to solve this system of equations by the Elimination method, then you must add both the equations and eliminate one of the 2 variables x or y

When both these equations are added, you get a new equation which is 4x =28.

Solve for x.

 x =-----

Now you substitute for x in one of the 2 original equations given in the problem and solve for y.

y =-----

There is only one answer and we call it the system solution. It is the ordered pair (x ,y) that makes both the equations true.

Answer 2

x-y=10. 3x+y=18

2x+2y=8

x=2, y=2

There's more than 1 answer.

Answer 3

Add the two equations together and solve for x.

Substitute value for x into either equation and solve for y.