Question

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(4y + 10°
What is the value of y?
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759
(3x)
B
y =

Answer 1

y = 5

Explanation:

The base angles of this isosceles triangle are congruent, so the angle at A is ...

A = 180° -2(75°) = 30°

(4y +10)° = 30° . . . . . substitute the given expression for angle A

4y = 20 . . . . . . . . . . divide by °, subtract 10

y = 5 . . . . . . . . . divide by 4

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Additional comment

The value of x is 25.

x is found from 3x=75, by dividing both sides of this equation by 3.