Question

Can someone help me with this problem:

Answer 1

The picture is to tiny to see

Answer 2

click to zoom

Answer 3

OK

Answer 4

I have no idea sorry havent learned this as yet

Answer 5

here we can solve the third equation for x, and we get:
x=-10-2z
is it ok?

Answer 6

yes ok

Answer 7

now, please you have to substitute that value of x into the first equation, namely:
\[ - ( - 10 - 2z) - y - z = 2\]
and then you have to solve for y, what do you get?

Answer 8

y=z+8

Answer 9

can i tag u for math please

Answer 10

ok!
now we have to substitute y=z+8, and x=-10-2z into the second equation, so we get:
\[ - \left( { - 10 - 2z} \right) - 3\left( {8 + z} \right) - 2z = 4\]
then you have solve that equation for z, what do you get?

Answer 11

@Howard-Wolowitz

Answer 12

yes

Answer 13

srry im lagging

Answer 14

z=-6

Answer 15

that's right!
now you have to substitute z=-6, into the expression for x, and y, namely:
x=-10-2*(-6)=...?
y=8+(-6)=...?

Answer 16

y=2

Answer 17

and x?

Answer 18

x=-10+12=...?

Answer 19

we have:
x=2
so the solution of your system is:
x=2, y=2, and z=-6
namely the third option