Question

x+y=5
-5x-y=15
Solve a system of equations using augmented matrices

Answer 1

I need an answer

Answer 2

1 1 | 5
-5 -1 |15
add R2 to r1
-4 0 | 20
-5 -1| 15
divide r1 by -4
1 0 | -5
-5 -1| 15
add 5 r1 to r2
1 0 |-5
0 -1|-10
multiply r1 by -1
1 0 |-5
0 1| 10

Answer 3

y=-x+5

then plug it into the other equation: -5x+x+5=15
simplify:
-4x=20
x=-5