Question

hl

Answer 1

1. Multiply the first equation by four and then take away equation one from equation two to eliminate the z variable.
You will get a equation with two variables.

2. Leaving the second equation how it was earlier, multiply it by 4, multiply the third equation by 4. Eliminate the z variable by adding the two equations together. Combined with step one you now have two equations you can solve simultaneously.

3. Follow the standard simultaneous solution procedure, making sure you substitute your values back into the original equation for z and not just y and x.