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Example 1
What is the equation of the line shown in the graphs below?
- $y=\dfrac{1}{3} x + 3$
- $7$
- $8$
- $y=x+3$
- $y=3x+3$
Solution
- We first determine coordinates of the $x$ and $y$ intercepts
$x$ intercept :$(-3,0)$ , $y$ intercept : $(0,3)$
- We next use the two points to calculate the slope $m$
$m=\dfrac{3-0}{0-(-3)}=\dfrac{3}{3}=1$
- Using the slope and the $y$ intercept, the equation of the line in slope intercept form is given by
$y=x+3$
Answer D
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