Tiberius has a credit card with an APR of 18.6%. On April 30, he had an unpaid credit card balance of $434. During the month of May, he charged $284.50 worth of
purchases to the credit card and made a $300 payment toward the card balance.
Calculate the monthly interest rate based upon the credit card's APR.

the first one, all those points on the line just make a strait line.

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative