Question

3x+y=4
x+2y=-2
what is the answer

Answer 1

2(3x+y=4)

1(x+2y=-2)

6x+2y=8

(-) x+2y=-2

5x=10

5

x=2

x+2y=-1

2+2y=-1

-2 -2

2y=-3

2

y=-3/2

Explanation:

1. multiply the first equation by 2 to make y equal to each other.
2. subtract to eliminate y
3. divide by 5 to get x
4. take one of the equations
5. replace x by 2 to solve for y