Answer:
for number 20, (already answered 21)
We select two points on the graph in the order of y over x (rise over run)
5/8 and 3/4
Let's subtract them from each other to figure out both changes of x and y
(Y2 - Y1)
_______
(X2 - X1)
so
5 - 3 = 2 change in y
_____
8 - 4 = 4 change in x
Now we are figuring out the slope, but since we solved for the changes of y and x it's already formatted for us so, 2(rise)/4(run) = 1(rise)/2(run), 1/2 is the slope
*remember that whenever finding slope we COULD subtract the smallest from the greatest so it's easier*
Now for 22,
we are subtracting the points 8(run)/9(rise) and 3(run)/5(rise)
but we need to format it like rise/run not run/rise so
9/8 and 5/3
subtract the smallest from the biggest coordinate
9 - 5 4
____ = ___ = 4/5 is your slope
8 - 3 5
Now for 23, we apply the same rule
-2 + (-3) -5
_______ = ______ = -5/6 is the slope
7 - 1 6
