Question

tell me how to do this please​

Answer 1

Answer:

because opposite sides are equal

x +7 = y + 8

x-y = 1

x+y = 3x-2y

3y = 2x

y = 2x/3 putting the in previous equation

x - 2x/3 = 1

x/3 = 1

x = 3

y = x-1 = 2

Answer 2

as we know that length of both side of a rectangle and breadth of both side of a rectangle are always equal

so X + 7 i=Y + 8

$x - y = 1 \: \: . \:.. \:... \:( 1) \\ x + y = 3 {}x - 2y \\ 2x = 3y \\ x = \frac{3y}{2} \\ put \: value \: of \: x \: in \: (1) \\ \frac{3y}{2} - y = 1 \\ y = 2 \\ so x = 3 \\ b = y + 8 = 10 \\ l = x + y = 2 + 3 = 5$