Question

30pts!!!
What is the value of y?



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Answer 1

x = 5

y = 15

Explanation:

This is an isosceles triangle so angles ∠B and ∠C are congruent.

We can write the following equation to first find the value of x then the value of y:

5x = 25

• Divide both sides by 5.

x = 5

The sum of interior angles in a triangle is equal to 180°.

25 + 25 + 7y + 25 = 180

• Add like terms.

75 + 7y = 180

• Subtract 75 from both sides to isolate the variable.

7y = 105

• Divide both sides by 7.

y = 15