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?
y
O 2x-2.1 = 7.5
O 4.2 + y = 7.5
X
O y-4.2 = 7.5
0 2.1 + 2 x = 7.5
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Answer 1

Option d) 2.1 + 2x = 7.5

Explanation:

An isosceles triangle is a triangle with two equal sides.

Perimeter of a triangle is some of all the 3 sides.

Let the equal sides be x

Let the third side be y

Therefore,

Perimeter = x + x + y

7.5 = 2x + y

7.5 = 2x + 2.1 [ given shortest side, y = 2.1m ]