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Slope-Intercept Form

Multiplying both sides of the equation  by xa yields
yb = m(xa)

Now, if the line passes through the y-axis at (0,b), then the equation becomes
yb = m(x – 0)
yb = mx
y = mx + b
This is called the slope-intercept form of the equation of a line, where m is the slope and b is the y-intercept. This form is convenient because it displays the two most important bits of information about a line: its slope and its y-intercept.


The equation of the line above is . Which one of the following must be true about line segments AO and BO ?

  1. AO > BO
  2. AO < BO
  3. AO ≤ BO
  4. AO = BO
  5. AO = BO/2

Since  is in slope-intercept form, we know the slope of the line is 9/10.


Now, the ratio of BO to AO is the slope of the line (rise over run).


Hence, . Multiplying both sides of this equation by AO yields .


In other words, BO is 9/10 the length of AO. Hence, AO is longer.


The answer is (A).

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