Question

If you wanted to eliminate the y variable by adding the two equations in the following system, what could be your first step?

x − y = 6

−4x − 4y = 10

Answer 1

you must do y=0, so is going to be x-0=6
x=6
replace x=6 in the 2nd question -4*6-4y=10
-10-4y=10
-4y=10+10
y=20/4
y=5