Question

Use the inverse matrix method to solve the following systems of equations.
2x+y=5
2x-y=-1

Answer 1

just add and get \(4x=4\) making \(x=1\)

Answer 2

and y = 3?

Answer 3

yes

Answer 4

can u help me with another one ?

Answer 5

depends on if i know it or not

Answer 6

go ahead and post

Answer 7

x+y+z=7
2x-6z=2
3x-2y+5z=13

Answer 8

oh three
ick
i would cheat, this is donkey work
or maybe someone else can show you how to do it step by step

Answer 9

lol . wow !

Answer 10

if you just need the answer, do this
http://www.wolframalpha.com/input/?i=x%2By%2Bz%3D7+%2C2x-6z%3D2%2C+3x-2y%2B5z%3D13

Answer 11

thanks

Answer 12

otherwise you can eliminate z from the first and third, then get two equations with two unknowns
it is totally doable, but takes a while and is a pain