Question

How to solve it elimination 4x-y=-1 -3x+y=3

Answer 1

(2, 9 )

Explanation:

4x - y = - 1 → (1)

- 3x + y = 3 → (2)

adding the 2 equations term by term will eliminate y

x + 0 = 2

x = 2

substitute x = 2 into either of the 2 equations and solve for y

substituting into (1)

4(2) - y = - 1

8 - y = - 1 ( subtract 8 from both sides )

- y = - 9 ( multiply both sides by - 1 )

y = 9

solution is (2, 9 )

Answer 2

x = 4

y = 15

Explanation:

4x-y=1

-3x+y=3

In elimination, you have to have at least one term where they are opposites, but with equal coefficients. Since this requirment is met, we can add the 2 equations. This gives us:

x=4

Now we substitute x to find y.

4(4)-y=1

16-y=1

-y=-15

y=15