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91Ó°ÊÓ

In the diagram abover∥s.

Solve for y:m∠3=8y-40 andm∠8=2y+20.

Short Answer

Expert verified

The value ofy is 20.

Step by step solution

01

Step 1. Highlight ∠3 and ∠8 in the given diagram.

02

Step 2. Apply the property of parallel lines.

If two parallel lines are intersected by a transversal then the same side interior angles are supplementary.

03

Step 3. Description of step.

From the given figure it can be observed thatr∥s andt is transversal then by the definition of same side interior angles,∠3 and∠8 are same side interior angles and by property of parallel lines, m∠3+m∠8=180.

04

Step 4. Description of step.

Substitute 8y−40for m∠3and 2y+20form∠8 intom∠3+m∠8=180 and simplify to obtain the value of y.

8y−40+2y+20=18010y−20=18010y=200y=20

Therefore, the value ofy is 20.

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