Question 324448
If x is the length of the rectangle then the width of the rectangle y = x-3. The perimeter is twice the width plus twice the length so 2*x + 2*(x-3) = 50. We solve this equation for x.

2*x + 2*(x-3) - 50 
2*x + 2*x - 2*3 = 50
4*x -6 = 50
4*x = 50 + 6
4*x = 56
x - 56/4
x = 14

so y = 14 - 3
   y = 11

So the length is 14 and the width is 11.