Question

Find the equation of a line with a slope of -1 that passes though the point (2,1) *

Answer 1

y = -x +b

Explanation:

The equation of a line is

y = mx+b where m is the slope and b is the y intercept

y = -1 x +b

Substitute the point into the equation

1 = -1*2 +b

1 = -2 +b

Add 2 to each side

1+2 = -2+b+2

3 =b

y = -x +3