The isosceles triangle has a perimeter of 7.5 m which equation can be used to find the value of x if the shortest side, y, measures 2.1 m?

we know that

In an isosceles triangle, the two equal sides are called legs, and the remaining side is called the base

so

In this problem

Let

x---------> the length side of the legs

y---------> the length side of the base

Perimeter of the triangle is equal to

substitute the values and solve for x

therefore

the answer is

The equation that can be used to find the value of x is

The value of x is

-2 is the right