The slope of the line that passes through (5, 4) and (-4,3) is 
<u>Solution:</u>
Given, two points are (5, 4) and (-4, 3)
We have to find the slope of a line that passes through the above given two points.
Slope of a line that pass through
is given as:



Hence, the slope the line that passes through the given points is 
We need to calculate the average balance per day.
In this case, the billing period has 31 days and Sandras has an unpaid balance of $720 during 28 days and unpaid balance of $720-$400=$320 during 3 days, so the average balance is:
Use the pie sunblo than use 5 plus 84
.11x+.08(180000-x)=17400
.11x+14400-.08x=17400
.03x=3000
x=$100,000 at 11%
$80,000 at 8%