Answer: y = -2x + 1
Solution:
To find the the equation use first find the slope using the equation:
m= y2-y1/x2-x1
m = -1-3/1-(-1)
m = -4/2
m = -2
Using the equation below,
y = mx + b
y = y coordinate
m = slope
x = x coordinate
b = y intercept
so to write the equation of line we need to find the y-intercept (b)
substitute the slope (-2) and any of the given pair of coordinates , right now i will be using (1,-1)
y = mx + b
-1 = (-2)(1) + b
-1+2 = b
1 = b
So the line of equation,
y = mx + b
y = -2x + 1
