Question

Please help solve number 18; photo attached below.

Answer 1

Since you are told to use the elimination method, please solve the first equation for x in terms of y. Then wherever you see x in the other two equations, substitute your function of y. Show your work, so I can comment on what you're doing.

Answer 2

if you multiply equation 2 by 5, then add it to equation 3, the z terms will go, leaving only x and y
then using the first equation you will have two equations with two unknowns