What are linear equations? could'ya explain too me, ? ! and how do you see what graph is a proportional relationship?

Simplify.7x + 3y - 2 + 6x + 1 + y squared 2 you! ; )

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle