Question

Write the equation of a line whose slope is -2 and goes through the point (1,-1)

Answer 1

y= -2x+1

Explanation:

y=mx+b

Substitute the ordered pairs into the equation

So:

y= -1 m(slope) = -2 x=1 b=?

-1 = (-2)(1) + b

-1 = -2 +b add 2 on both sides to get b by itself

-1 +2 = b

b=1