Question

Which lines can you conclude are parallel given that M<7 + M<11 =180? Justify your conclusion with a theorem.
Line a is parallel to line b by the Converse of the Alternate Interior Angles Theorem.
Line c is parallel to line d by the Converse of the Same-Side Interior Angles Theorem.
Line a is parallel to line b by the Converse of the Same-Side Interior Angles Theorem.
Line c is parallel to line d by the Converse of the Alternate Interior Angles Theorem.

Answer 1

do you have picture attached to this q ?

Answer 2

M<7 + M<11 =180

means, they are supplementary

Answer 3

observe that 7 and 11 are 'same side interior angles' for the lines a and b

Answer 4

so, a is parallel to b by the converse of same side interior angles theorem