Question

x-y+2=1
2x+3y-5z=7
3x-4y-2z=-1​

Answer 1

Answer:

x-y=1-2

x-y= -1 equation 1

2x+3y-5z=7 equation2

+x- y =-1

3x+2y-5z= 6

- 3x-4y-2z =-1

6y-3z =7 equation3

equation2

2(-1+y)+3y-5z=7

-2+2y+3y-5z =7

2y+3y-5z=7+2

5y-5z=9

equation4

6y- 3z =7

5y - 5z=9

equation3 multiplay 5

30y-15z=35

+15y-15z =27

- + -

15y =8

y=8/15

x-8/15=-1

x=-1+8/15

x=-15+8/15

x=-7/15

equation2

2×-7/15+3×8/15-5z=7

-14/15+8/5-5z=7

-14+24/15-5z=7

10/15-5z=7

2/5-5z=7

-5z=7-2/5

-5z=35-2/5

-5z=33/5

z=33/5×-5

z=33/-25