Question

question 9 of 10
the graph of the equation representing simple interest is that of:
a. linear function.
b. exponential function.
c. quadratic function.
d. none of the above

Explanation:

Step1: Recall simple interest formula

The simple interest formula is $I = Prt$, where $I$ is interest, $P$ (principal), $r$ (rate) are constants, and $t$ (time) is the variable.

Step2: Match to linear form

Rewrite as $I = (Pr)t + 0$, which follows the linear form $y = mx + b$ (where $m=Pr$, $b=0$).

Step3: Conclude function type

Linear functions graph as straight lines, so simple interest is linear.

Answer:

A. linear function.