Question

Solve {x-2y=2 and 3x-5y=9} by writing and solving a matrix equation. Show work.

Answer 1

for matrix u take the coeffecients and write like this
|1 -2 | |x | |2|
|3 5 | |y| = |9|

Answer 2

wait shouldn't it be -5?

Answer 3

yep sorry

Answer 4

good catch :)

Answer 5

no probs :) anyways when you multiply 1 and -5 then subtract the sum of -2 and 3... oh shoot... I added -2 and -3... instead of multiplied -2 and 3...

Answer 6

let me try this quick

Answer 7

okay so now basically we can do row operations and stuff to bring the leftside in the form
|1 0| |x| = | |
|0 1| |y| =| | <--- right side some new numbers after the row operations

Answer 8

people often write it like this too