33x I think sorry if I am wrong
the last one because 7*3=21 14*3=42 and 21*3=63
Once you solve for z, you will get z = -1/y + w/xy. :)
Use elimination method - I am eliminaing the y-variable.
1(5x + 8y = 16) → 5x + 8y = 16
4(6x - 2y = 54) → 24x - 8y = 216
Add equations: 29x = 232
Divide by 29: x = 8
Answer: x = 8
