This is my third time posting this question, which is my fault. my teacher does not want me to use substitution rules.

using rules of inference and no substitution, prove that:

–p +-q) + (pλq)

and:

(5l + d) + (byd)

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

the formula of a slope:

we have the points (-2, 7) and (2, 3). substitute:

answer: the slope is equal -1.