Question

Solve for y.
A. 10
B.12
C. 15
D. 18

Answer 1

Y=10°
If we're solving for the ninety degree angle, which I seem to doubt, then if 3x=90 then 2x=60 giving a missing total of 30. 30/3 equals 10

Answer 2

Option A is the correct answer.

The value of y is:

A. 10

Explanation:

From the figure we could see that:

3x=90°

so on dividing both side of the equation by 3 we obtain:

x=30°

and we see that ∠DBC=90°

Hence, we get:

2x+3y=90

on putting the value of x in the expression we get:

2×30+3y=90

i.e. 60°+3y=90°

⇒ 3y=90°-60°

⇒ 3y=30°

on dividing both side of the equation by 3 we obtain:

y=10°

Hence, the value of y is:

A. 10