book Maths Puzzle Numerical Ability

how to solve x+Y=5 pLEASE GIVE ME SOMEONE IN THE KANSAS CITY AREA THAT CAN GIVE ME FREE TUTOR I NEED HELP VERY BAD,

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solve for x:
(y-1)/(y+4)=(y+1)/(y-2)
The perimeter of a rectangle is 150 feet. The length of the rectangle is twice the width. Find the length and width of the rectangle.