Question

(2,4) (x,8) slope = -2 what is x?

Answer 1

X is equal to zero because the equation for slope is the change in Y/change in x.
If we plug in the known values and set the equation equal to -2, x is 0. (4-8/2-x=-2 , 4-8/2-0= -4/2 or -2).

You can ask me any questions if my explanation what confusing haha.

Answer 2

Answer:

x = 0

Step-by-step explanation:

The formula of a slope:

$m=\dfrac{y_2-y_1}{x_2-x_1}$

We have:

the points (2, 4) and (x, 8)

the slope m = -2

Substitute:

$-2=\dfrac{8-4}{x-2}$

$-2=\dfrac{4}{x-2}$

$\dfrac{-2}{1}=\dfrac{4}{x-2}$         cross multiply

$-2(x-2)=(1)(4)$

$-2(x-2)=4$          divide both sides by (-2)

$\dfrac{-2(x-2)}{-2}=\dfrac{4}{-2}$

$x-2=-2$            add 2 to both sides

$x-2+2=-2+2$

$x=0$