Today’s SAT question of the day is a math question about function notation (the way functions are written).  This question is rated medium difficulty…maybe it’s just my years of tutoring talking, but I thought it was more like mega-easy (I solved it in less than10 seconds).

A function is just a relationship between values, right?  When x changes, y consistently changes in a related way.  And functions are written in a special format:

f(x) = ……

which means that “f of x”, or the function relating to x, is whatever appears on the other side of that equal sign.

This question also asks us about slope, so let’s think of what we know about slope: Continue reading →