Question

Write in slope-intercept form an equation of the line that passes through the given points.

(1, 2), (−2, −1)

Answer 1

Answer:

x - y +1 = 0 is the required equation.

Step-by-step explanation:

First we need to find the slope of the line;

m = y2 - y1 / x2 - x1

x1 = 1, x2 = -2, y1 = 2, y2 = -1

m = -1-2/-2-1

m = -3/-3

m = 1

now find the y-intercept;

y1 =mx1 + b

2 = 1(1) + b

b = 1

now the equation;

y = mx + b

y =1(x) + 1

= y = x +1