Understanding SAT Math (Part 2 of 8): Linear Equations
To achieve even a moderate score on the SAT, students must understand Linear Equations, and know the two “forms” that are used to describe them.
Most already know Slope-Intercept Form: y = mx + b
But most do not know Standard Form: Ax + By = C
And although many students can say that a line is represented by y = mx + b, and that m is the slope, very few can DEFINE what the slope is, and understand the LOGICAL IMPLICATION of a given slope for a single line or a system of two linear equations.
But understanding these equations and the definition of the slope is very important, as on a typical test three to five questions (representing 30-50 points) are based on this understanding alone.
And as important as Linear Equations are on their own, they’re also the essential foundation for an even more important topic, Linear Models, which will be the topic of the next post.