Question

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? 2x - 2.1 = 7.5 4.2 + y = 7.5 y - 4.2 = 7.5 2.1 + 2x = 7.5

Explanation:

Step1: Recall perimeter formula

The perimeter $P$ of a triangle is the sum of the lengths of its sides. For an isosceles triangle with two equal - length sides of length $x$ and a third side of length $y$, $P = 2x + y$.

Step2: Substitute given values

We know that $P = 7.5$ m and $y = 2.1$ m. Substituting these values into the perimeter formula, we get $7.5=2x + 2.1$, which can be rewritten as $2.1 + 2x=7.5$.

Answer:

D. $2.1 + 2x = 7.5$