There are 6 quarters in a jar. Jill adds 2 quarters to the jar every day. Write a linear equation in slope-intercept form to represent the total amount of quarters in the jar after x days.
Initial number of quarters; 6
x = number of days
Number of quarters added after x days: 2x
Total amount of quarters, y = 2x + 6
Note: the slope is 2 and the y-intercept is 6.