Solve the system of equations. (#,#,#) format?

Question

Solve the system of equations.

3x + 2 = –18 + 5y

8y – 6 = 4x + 9y

y – 10 = 3x + 2z 

Answer 1

This looks like 3 linear equations in 3 unknowns, but it rally isn't.

The first wo contain no z; the second equation can be resolved to y = -4x - 6; substitute into th first equation and solve for x. The use the value of x to solve for y.

Then use the values for x and y to get z in the last equation.