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The isosceles triangle has a perimeter of 7.5 m.

Which equation can be used to find the value of [tex]x[/tex] if the shortest side, [tex]y[/tex], measures 2.1 m?

A. [tex]2x - 2.1 = 7.5[/tex]
B. [tex]4.2 + y = 7.5[/tex]
C. [tex]y - 4.2 = 7.5[/tex]
D. [tex]2.1 + 2x = 7.5[/tex]

Answer :

To find the value of [tex]\( x \)[/tex] for the isosceles triangle with a perimeter of 7.5 meters and a shortest side measure of 2.1 meters, we need to set up an equation for the perimeter.

An isosceles triangle typically has two sides that are equal in length and a base which is the shortest side, in this case, [tex]\( y = 2.1 \)[/tex] meters.

The perimeter of the triangle is calculated as the sum of all its sides:

[tex]\[ \text{Perimeter} = x + x + y = 7.5 \][/tex]

Given that the shortest side [tex]\( y \)[/tex] is 2.1 meters, substitute this value into the equation:

[tex]\[ x + x + 2.1 = 7.5 \][/tex]

This simplifies to:

[tex]\[ 2x + 2.1 = 7.5 \][/tex]

Now, we have an equation that can be used to find [tex]\( x \)[/tex]. Based on the given options, the correct equation that represents this situation is:

[tex]\[ 2.1 + 2x = 7.5 \][/tex]

Therefore, using this equation, you can proceed to solve for [tex]\( x \)[/tex] if needed, but the correct form of the equation has been identified.

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