The perimeter of this isosceles triangle is 47 cm. what is the length of each of its legs?

the answer is going to be 17.5, 35/2 is 17.5

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

the first one, all those points on the line just make a strait line.