2.9 - Proving Parallel Lines

Find m<ABC so that m // n.

Find x so that m // n. Do not type x=.

Find x so that lines l and m are parallel. Do not type x=.

Which theorem or postulate would you use to prove lines l and m parallel?

• Alternate Exterior Angles

• Alternate Interior Angles

• Corresponding Angles

• Consecutive Interior Angles are supplementary

Find x so that lines l and m are parallel. Do not type x=

Identify the postulate or theorem to make lines l and m parallel.

• Alternate Interior Angles

• Alternate Exterior Angles

• Corresponding Angles

• Consecutive Interior Angles are supplementary

Identify the postulate or theorem to make lines l and m parallel.

• Alternate Interior Angles

• Alternate Exterior Angles

• Corresponding Angles

• Consecutive Interior Angles are supplementary

Solve for x so that lines l and m are parallel. Do not type x=.

If 

a∥b and m∠7=(3x+5)°, and m∠6=(2x-6)° solve for x. Round to the tenth. Do not type x=.

Solve for  y. Do not type y=