Question 1072011
 
 
Find the equation of the line with m = 3 and passing through point (3, 0). 
 
a) y = 3x – 9
b) y = 3x – 3
c) y = 3x + 9
d) y = 3x + 3

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To solve, compare y = mx+b  (m=slope, b=y-intercept) to see which of the choices work.  They all have m=3 so then the next question is which one passes through (3,0)?

a)  y = 3(3) - 9 = 0  —> this equation,  y=3x-9,  satisfies both conditions: slope=3 and that the line passes through (3,0).
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So (a) is the answer.