Question

A line contains the points (4,5) and (3, -9). Write the equation of the line using point-slope form.

A.y +4= -2(x - 3)
B.y +5= -2(x-4)
C. Y-3 = -2(x +9)
D. y-5=-2(x+4)

Answer 1

C

Explanation:

original formula is: y - y1 = m (x - x1) ordinates= (x1, y1)

insert the a corresponding x and y coordinate:

y + 3 = -2 (x + 9)

Don't forget to change the signs depending on whether their positive or negative:

(3, -9) since 3 is positive but there is a minus in the formula it would be -3

since -9 is negative and in the equation there's a minus sign you would change it to positive. (negative times a negative equals a positive)