4x-2y=-5
-x+2y=2
Adding the two equations together gives
4x-2y+-x+2y=-5+2
the ys on the LHS cancel to give
4x-x=-3
3x=-3
x=-1
substitute x=-1 into one of the starting equations.
4(-1)-2y=-5
-4-2y=-5
-2y=-1
y=1/2
Have a go at the others.
I am solving sytems of equations algrbraically. I have tried several times and I am not comming up with he answers for the following three equations that the book gives.
1) 4x-2y=-5
-x+2y=2
Answer in book: -1,1/2
2) -5x+2y=10
5x-3y=-10
Answer in book: -2,0
3) 2x-y=2
-2y+4y=-5
Answer in book: 1/2,-1
1 answer