Question

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

Answer 1

elimination would be better

Answer 2

|5 -3| 18|
|2 7 | -1|

Answer 3

row operations will give you:
| 1 0| 3 |
| 0 1|-1|
do you see your answer?

Answer 4

No, lol

Answer 5

it's means:
x=3 and y=-1
OK now?

Answer 6

|5 -3| 18| = |10 -15 |26 | = | 5 -3 | 18 | = |5 0 | 15|
|2 7 | -1| |-10 -35| 5 | |0 -41| 41| |0 1 | -1|
and so on

Answer 7

|5 0 | 15| is the final answer?
|0 1 | -1|

Answer 8

you simplify this one to:
| 1 0| 3 |
| 0 1|-1|
and final answer in x & y:
x=3 (top row) and y=-1 (lower row)