More Math Help!

[Metal425]

Time for some more Math help! Lol....
Will give rep for correct answers.

Use Linear Combination to solve the system.


1.
x-2y=9
-3x+2y=-19


2.
-2x+3y=14
x-4y=-12

3.
2x-y=16
3x+5=11

4.
5x-4y=-30
2x+3y=-12

5.
-x-5y=30
2x-7y=25

6.
5x+2y=5
3x+y=2

7.
4x-5y=6
2x+3y=-8

8.
x-4y=14
-x+3y=-11

9.
2x-3y=-16
x+3y=10

10.
-3x+5y=-4
3x+4y=36

11.
-x+8y=16
3x+4y=36

12.
2x+5y=-22
4x-3y=8

13.
-7x+8y=32
5x+6y=24


THANKS!

 

[ArmedCitizen]

Really? You need help with the basics of Algebra? If you don't understand this you will fail all the rest of your math afterwards so you might as well take the time to learn it now.

 

[Metal425]

I understand there is like
2x-y=-3
-5x+y=9

But I don't know what to do when I have 2 variables with numbers too.

 

[Metal425]

Nevermind, found a calculator for it.

 

[New_U.S.]

. wow. well you should probably at least know how to do it instead of just using a calc...

x-2y=9
-3x+2y=-19

add the like terms (x, y, constant) so x + -3x; -2y +2y; 9 + -19

you end up with -2x=-10
x=5

then plug back in x and solve for y
5-2y=9
y=-2

you gotta cancel out one of the variables (-y + +y = 0) just remember that whatever you do to one term you have to do to everything else... that simple

yay 8th grade algebra.... xD

 

[sqrage]

This forum isn't your personal homework solver guide.