Question

Will Fan and give medal for help? ^^

Solve, using linear combination.

3x – y = 4
2x + y = 6

Answers:
(–1, –7)
(0, –4)
(2, 2)
(3, 0)

Answer 1

Rearrange both equations to get y on its own, then you can set them equal to each other.

Ignore the y parts for now and rearrange to get x.

After that you can put x back in to the equations for y (check both give the same answer).

Answer 2

huh? :o @broken_symmetry

Answer 3

Ok, do the first part. Rearrange your two equations so they read y = _____

Answer 4

Just add the two equations. That will get rid of y and you can solve for x.
Then pt x in first equation and solve for y.

Answer 5

3x – y = 4
2x + y = 6
Add the two equations:
5x = 10
divide both sides by 5
x = 10/5 = ?

Answer 6

If you have a matrix calculator, plug the numbers in and do matrix A^-1*matrix B.

Answer 7

-y +y cancel out its alot easier, so its just 5x = 10

5x = 10
/5 /5

x = ?