Question

Which ordered pair is a solution of the system: 3x + 2y = 4 and -x + 3y = -5 ?

Answer 1

So first, can you try and solve both eq for the same variable please?

Answer 2

Or just solve one equation for one variable. Perhaps a more efficient version.

Answer 3

i dont know how thats the problem lol

Answer 4

Can you solve this equation for x?
3y - x = 5
It doesn't matter if the y is still there.

Answer 5

oh yea okay, let me solve it real quick

Answer 6

ok, then do the same for the other

Answer 7

okay so for 3y-x=5 so i got y=2

Answer 8

and the other one is -1 , am i right?

Answer 9

uhm, you shouldn't get a number. You should get an eq set up like this x=blah blah y blah or y=blah x blah blah

Answer 10

I'd like to suggest a different method of solution: elimination by addition/subtraction.
3x + 2y = 4 and -x + 3y = -5

can be re-written as

3x + 2y = 4
-x + 3y = -5

Multiply the second equation by 3. Then add this result to 3x + 2y = 4. What happens?

Answer 11

ahh, the matrix way. I totally forgot they do that at this level Nice addition @mathmale