haleylooove Group Title Find the value of x so that the line passing through (10, 5) and (x, 9) has a slope of -2 one year ago one year ago

slope is $$\frac{9-5}{x-10}$$ and you want that to be equal 2, so set $\frac{4}{x-10}=2$ and solve for $$x$$
you get $\frac{4}{x-10}=2$ $4=2(x-10)$ $2=x-10$ $x=12$