Question

Azizah got 1 for the slope of the line through 2 points (1,2) and (4,-1). Explain to her the mistake she made and how to find the slope correctly

Answer 1

(1,2)(4,-1)
slope = (y2 - y1) / (x2 - x1)
slope = (-1 - 2) / (4 - 1) = -3/3 = -1

the slope is -1......I am not sure of the mistake.....unless she just added (-1 - 2) and got 3 instead of -3.......or when dividing -3/3....she maybe forgot about the negative sign

Answer 2

slope = -1

Explanation:

Azizah got 1 for the slope of the line through 2 points (1,2) and (4,-1).

To find out slope apply slope formula

`slope =(y_2-y_1)/(x_2-x_1)`

(1,2) is x1,y1

(4,-1) is x2,y2

`slope =(-1-2)/(4-1)`

`slope =(-3)/(3)=-1`

So the slope is -1 not 1

She made a mistake in the negative sign

-1-2 is -3. negative by positive is negative