Question

x+y-z=5
2x-y+3z=-3
2x+3y=-4

Answer 1

could you help me out, kelligirl?

Answer 2

you writing down the problem to go over it step by step with me?

Answer 3

i think she is writing the whole solution!

Answer 4

yes

Answer 5

x + y - z = 5 ---->(3)
2x - y + 3z = -3
--------------
3x + 3y - 3z = 15 (result of multiplying by 3)
2x - y + 3z = -3
--------------add
5x + 2y = 12

2x + 3y = -4 -->(-2)
5x + 2y = 12 -->(3)
----------------
-4x - 6y = 8 (result of multiplying by -2)
15x + 6y = 36 (result of multiplying by 3)
-----------------add
11x = 44
x = 44/11
x = 4

2x + 3y = -4
2(4) + 3y = -4
8 + 3y = -4
3y = -4 - 8
3y = -12
y = -12/3
y = -4

x + y - z = 5
4 - 4 - z = 5
-z = 5
z = -5

check...
x + y - z = 5
4 - 4 -(-5) = 5
0 + 5 = 5
5 = 5 (correct)

x = 4, y = -4, z = -5

Answer 6

ok

Answer 7

but

Answer 8

ehh

Answer 9

wait

Answer 10

if you have any questions, please ask

Answer 11

oh yes

Answer 12

I should have said: solve the equation using Cramer's rule

Answer 13

like this