Question

Check my answer
Solve with matrices.
5x -3y = 18 and 2x + 7y = -1

I got ....
x=31/18
y=-3/5

Am I right?

Answer 1

no...but remember you can check for yourself, plug in those values

Answer 2

.... that was my line panlac lol

Answer 3

my bad... I can delete it

Answer 4

no need to delete :)

Answer 5

Oh okay, well I did & it wasn't.. Crud. Well I am confused on part of it, so when I have to do one row of the matrices that is 5 -13 18 to get it to 1 0 c1 How do I do that?

Answer 6

is this cramer rule? or row operations?

Answer 7

I think row of operations is the way to go.

Answer 8

Uhh. I don't know.. But I have to get the row to 1 0 c1, like 5 has to change to 1 and -13 has to change to 0 somehow.

Answer 9

yeah you have to divide the whole row by 5 then

Answer 10

hey cutie,have u been taught matrix inversion?which makes the solution much simpler.....

Answer 11

@RyanL. Well that would give me 1 -13/5 18/5. How would I get -13/5 to zero with out changing the 1?
@hartnn Maybe, math isn't my strong point to I have no idea the fancy names... Sorry.

Answer 12

Well when we row reduce we want every number bellow that 1 to be a zero

Answer 13

well you need to subtract the second row by the first row but before that you need to multiply the first row by 2