Be able to recognize expressions Be able to write and solve real-world equations, inequalities, and systems of equations or inequalities. Recognize what portions of expressions and equations (for example, coefficients, terms, and factors) represent in a real-world situation.

Recognize the relationship between the slopes of parallel and perpendicular lines, as well as the relationship between the slopes of perpendicular lines. Recognize congruent and supplementary angles given two parallel lines and a transversal. Be able to distinguish between acute, right, and obtuse triangles.