Answer:
y= -2x
Step-by-step explanation:
First find the slope
m = ( y2-y1)/(x2-x1)
= ( -4- -2)/(2-1)
= ( -4+2)/( 2-1)
-2/1
-2
Using y = mx+b where m is the slope and b is the y intercept
y = -2x+b
Substitute a point into the equation
-2 = -2(1)+b
-2 = -2+b
b=0
y= -2x
