Which lines can you conclude are parallel given that M

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.

ganeshie8 · Answer

do you have picture attached to this q ?

anonymous · Answer

attachment

ganeshie8 · Answer

M<7 + M<11 =180

means, they are supplementary

ganeshie8 · Answer

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

ganeshie8 · Answer

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