Suppose that [math] is a linear function of [math] and [math] with slope -5 in the [math] direction and slope 5 in the [math] direction.

(a) A change of [math] in [math] and [math] in [math] produces what change in [math]?
change in [math]

(b) If [math] when [math] and [math], what is the value of [math] when [math] and [math]?
[math]

Solution: