So g(x)=−12x+2g(x)=−12x+2 is perpendicular to f(x)=2x+4f(x)=2x+4 and passes through the point (4, 0). Be aware that perpendicular lines may not look obviously perpendicular on a graphing calculator unless we use the square zoom feature....
ETS GRE also allows students to use an on-screen calculator. The following are concepts that are tested in the Quantitative Reasoning section of the GRE: Algebra questions include operations with exponents; factoring and simplifying algebraic expressions; relations, functions, equations and inequalities...