Answer: y/y+x
Step-by-step explanation: Reduce the fraction at the bottom (1 - x/y) (1 + x/y) = 1 + x/y = simplify and you get y/y+x
1. Multiply both sides by 4x-1

2.Simplify

3.Multiply both sides by 7
4x-1=3x7
4.Simplify 3*7 to 21
4x-1=21
5. Add one to both sides
4x=21+1
6. Simplify 21+1 to 22
4x=22
7.Divide both sides by 4
x=
8.Simplify

to
Answer:
8 dollars
Step-by-step explanation:
if "x" is his weekly allowance:
x-0.5x+8=12
Dan make x dollars, then he spend 0.5x dollars and he earned 8 dollars, and that is 12 dollars.
0.5x=12-8
x=8 dollars
For the triangles to be congruent
x=y+5 .......(substitute in the second equation)
x+3=3y.........(y+5) + 3 = 3y , 2y = 8 ,
y = 4 , x = 9