SOLUTION: Could someone show me how to write an equation from a graph when the line is vertical and in quad. 1,3 and intercepts x on -3

Question 427014: Could someone show me how to write an equation from a graph when the line is vertical and in quad. 1,3 and intercepts x on -3
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Could someone show me how to write an equation from a graph when the line is vertical and in quad. 1,3 and intercepts x on -3
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It can't be vertical if it passes thru quadrants I and III.
It must have a slant, or slope.
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If it passes thru x = -3 you know the x-intercept but
not the y-intercept.
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So all you know is the form of the equation is y = mx + b
and (-3,0) satisfies the equation:
So, 0 = m(-3)+b
b = 3m
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m = -b/3
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The equation would be y = (-b/3)x + 3m
You would have to know "m" to get a final
form for the equation.
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Cheers,
Stan H.
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