Question

how do you find the y and the x in the following equations:
y+3x=5
x-y=1

Answer 1

Well in x-y=1 you can bring y to the other side, which forms....
x=1+y
lets substitute y+1 for the x in the first equation.
y+3(y+1)=5
y+3y+1=5
4y+1=5
bring 1 to the other side...
4y=4 so
y=1