Question

solve each equation using linear combination
-x + 4y = -1
2x - y = 5.5

Answer 1

you can eliminate
to eliminate you should have one variable with same coefficient but opposite sign

Answer 2

you can multiply first equation by 2 to eliminate x or either you can multiply second equation by 4 to eliminate y which one you want

Answer 3

what you get when you multiply first equation by 2 ??