Answer:
B, -1
Step-by-step explanation:
on a graph with 2 points (or more) listed, you can count the points from each coordinate to determine slope (which is rise/run also known as y/x)
going from left to right, we start at (1,4) and count down from (1,4) to (3,2), we go down 2 units
going from left toright again, we start from (1,2) (our point we counted down to from (1,4) and count to the left 2 units
we are now at (3,2)
it took us 2 points down (negative) and 2 to the right (positive) to get from (1,4) to (3,2)
using rise/run we have the following:
-2/2 < we can simplify this further by dividing -2 by 2 and getting 1
the answer is B, -1
ANOTHER WAY
another way we can calculate the slope is by the following formula
y2 - y1/ x2- x1
(1,4) is our x1 and y1, while (3,2) is our x2, y2. we plug this into the formula and we get:
y2 - y1 = 2 - 4 = -2
x2 - x1 = 3 - 1 = 2
-2 / 2 = -1
we still have the same answer, and this formula is useful when you dont have a graph to count down from