Question

Find the value of x so that the line passing through (10, 5) and (x, 9) has a slope of -2.

Answer 1

Well we know that to find the slope, it's (y2-y1)/(2-x1)=slope
So if (10,5) is your first point and (x,9) is your second and you already know the slope, just plug and chug! :)

Answer 2

Oops, that should be (y2-y1)/(x2-x1)

Answer 3

IMPORTANT LINE RELATED EQUATIONS TO KNOW AND MEMORIZE

slope formula
m= slope/ gradiant -- same thing
\[m=\frac{y_2-y_1}{x_2-x_1}\]

standard formula
\[Ax+By=C\]

point-slope formula
\[y-y_1=m(x-x_1)\]

slope-intercept formula
b= y-intercept -- in the form of (0,y)

\[y=mx+b\]