HELP WILL GIVE BRAINLIEST

What two criteria are needed for triangles to be similar

The length of a rectangle is x times the square root of 100. the width is one-half y more than three-halves x. given that the area of the rectangle is 125 cm2, which equation could represent the rectangle in terms of x and y? a) 5xy − 15x = 125 b) 5xy + 15x = 125 c) 15x2 − 5xy = 125 d) 15x2 + 5xy = 125

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827