So far we have looked at equations of lines and determined information about the line in order to graph it.

Today we are going to do the reverse.

A line has slope 7 and a y-intercept of -4, what is the equation of the line?

A line has slope -4/5 and goes through point (1,3) what is the equation of the line?

A line has slope 2/3 and goes through point (8,1) what is the equation of the line?

y = 2/3x + b

1 = 2/3(8) + b

1 - 16/3 = b

3/3 - 16/3 = b

-13/3 = b

A line has slope 1/9 and goes through point (-2,5) what is the equation of the line?

y = 1/9x + b

5 = 1/9(-2) + b

5 = -2/9 + b

5 + 2/9 = b

47/9 = b

A line has slope 4 and goes through point (2,1) what is the equation of the line?

What is the equation of this line?

b = 2m = -1

y = -1x + 2