Answer:
Step-by-step explanation:
8
−
(
−
12
)
Multiply
−
1
by
−
12
.
−
8
+
12
Add
−
8
and
12
.
4
to get the slope of a line all we need is two points off of it, so let's get two points from that table

![\bf \stackrel{slope}{m}\implies \cfrac{\stackrel{rise} {\stackrel{y_2}{\frac{5}{3}}-\stackrel{y1}{\frac{1}{3}}}}{\underset{run} {\underset{x_2}{3}-\underset{x_1}{1}}}\implies \cfrac{~~\frac{4}{3}~~}{2}\implies \cfrac{~~\frac{4}{3}~~}{\frac{2}{1}}\implies \cfrac{\stackrel{2}{~~\begin{matrix} 4 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}}{3}\cdot \cfrac{1}{~~\begin{matrix} 2 \\[-0.7em]\cline{1-1}\\[-5pt]\end{matrix}~~}\implies \cfrac{2}{3}](https://tex.z-dn.net/?f=%5Cbf%20%5Cstackrel%7Bslope%7D%7Bm%7D%5Cimplies%20%5Ccfrac%7B%5Cstackrel%7Brise%7D%20%7B%5Cstackrel%7By_2%7D%7B%5Cfrac%7B5%7D%7B3%7D%7D-%5Cstackrel%7By1%7D%7B%5Cfrac%7B1%7D%7B3%7D%7D%7D%7D%7B%5Cunderset%7Brun%7D%20%7B%5Cunderset%7Bx_2%7D%7B3%7D-%5Cunderset%7Bx_1%7D%7B1%7D%7D%7D%5Cimplies%20%5Ccfrac%7B~~%5Cfrac%7B4%7D%7B3%7D~~%7D%7B2%7D%5Cimplies%20%5Ccfrac%7B~~%5Cfrac%7B4%7D%7B3%7D~~%7D%7B%5Cfrac%7B2%7D%7B1%7D%7D%5Cimplies%20%5Ccfrac%7B%5Cstackrel%7B2%7D%7B~~%5Cbegin%7Bmatrix%7D%204%20%5C%5C%5B-0.7em%5D%5Ccline%7B1-1%7D%5C%5C%5B-5pt%5D%5Cend%7Bmatrix%7D~~%7D%7D%7B3%7D%5Ccdot%20%5Ccfrac%7B1%7D%7B~~%5Cbegin%7Bmatrix%7D%202%20%5C%5C%5B-0.7em%5D%5Ccline%7B1-1%7D%5C%5C%5B-5pt%5D%5Cend%7Bmatrix%7D~~%7D%5Cimplies%20%5Ccfrac%7B2%7D%7B3%7D)
The first pipe pumps out

while the second pipe pumps out

So together, both pipes pump out

That is, with both pipes filling the tank, it should take 32 minutes total.