(1.2x + y + 3z = 12 2. x-2y+=-5
3.5x – y + 2z = 5
a. Use equations 2 and 3 and eliminate the z by multiplication and addition, creating a new equation with only two variables.
b. Use equations 1 and 2 and eliminate the z by multiplication and addition, creating a second equation with only two variables.
c. Use the two new equations, and eliminate the 3-variable by multiplication and addition, finding the value for the y-variable.
d. Substitute y-value in the second new equation and find the 3-value.
e. Substitute the 2 - and y
values into original equation 2 to find the 2 -value