Algebra
posted by G on .
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) 4x2y=5
x+2y=2
Answer in book: 1,1/2
2) 5x+2y=10
5x3y=10
Answer in book: 2,0
3) 2xy=2
2y+4y=5
Answer in book: 1/2,1

4x2y=5
x+2y=2
Adding the two equations together gives
4x2y+x+2y=5+2
the ys on the LHS cancel to give
4xx=3
3x=3
x=1
substitute x=1 into one of the starting equations.
4(1)2y=5
42y=5
2y=1
y=1/2
Have a go at the others.