Question

I will attach the problem.

Answer 1

May I help?

Answer 2

yes

Answer 3

No problem for late!
Like that we would find the answer after 2 weeks! ;)

Answer 4

These are very simple set of three equations with three variables which could be solved by more than one method.

Easiest one is the "elimination method"

Here is the steps included in the pic attached!

I hope that helps!

and sorry again for late!

Answer 5

Also there are very interesting and cool sites that doing so. But I recommend you use these just for check.

These are like that:
www.mathportal.org/calculators/system-of-equations-solver/system-3x3.php?val1=1&combo1=2&val2=3&combo2=1&val3=2&val4=1&val5=-1&combo3=1&val6=4&combo4=2&val7=4&val8=1&val9=5&combo5=2&val10=1&combo6=1&val11=6&val12=9&rb1=g

Answer 6

Sorry I forgot to attach the file I prepared for you!

That is it!