What is the value of y? y =

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2 Answers
Dec 13, 2017

y=5 Degrees

Explanation:

.

We know the sun of the angles of any triangle is 180. Therefore:

4y+10+3x+75=180

4y+3x+85=180

4y=1803x85

4y=953x

y=953x4

But since the triangle shown is an isosceles triangle, the two base angles are congruent:

3x=75

We will plug this in:

y=95754=204=5 Degrees

Dec 13, 2017

y=5

Explanation:

AC and AB are equal so,

3x=75

Sum of all the internal angles of a triangle is 180.

(4y+10)+75+3x=180
4y+10+3x=105
4y+3x=95

From above,

4y+75=95
4y=20
y=5