x-z=5
y+3z=12
2x+y=7

with steps please its kinda confusing me

Question

x-z=5
y+3z=12
2x+y=7 

with steps please its kinda confusing me

mathstudent55 · Answer

Take the third equation and solve for y.
Can you do that?

anonymous · Answer

show me how to doit.. please

mathstudent55 · Answer

The third equation is:
2x + y = 7
To solve for y, we need to get y by itself. That means we need to subtract 2x from both sides.

anonymous · Answer

just show me how to solve for y after that i can do it

mathstudent55 · Answer

2x + y = 7
 -2x             -2x
------------------
           y = 7 - 2x
This is the third equation solved for y.

Now substitute 7 - 2x for y in the second equation.

anonymous · Answer

oh baby i love you i got it like a boss... THX i will be your fan for you now!!

mathstudent55 · Answer

Once you do the substitution above, then you can solve that new equation together with the first one as a system of two equations in 2 unknowns, x and z.

mathstudent55 · Answer

You're welcome.