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italian18 Group Title

What is the equation of the line that passes through (12, 4) and is perpendicular to the graph of y = –1/3x – 2?

  • 2 years ago
  • 2 years ago

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  1. brinethery Group Title
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    Look at your slope of that line. The slope is -1/3. In order for your other line to be perpendicular, it needs to be the "negative inverse." That means you have to flip the -1/3 and then multiply it by -1. -1*(-3/1) = 3 So you have your point (12,4) and your slope m=3 Plug these values into y=mx+b to get your b-value (y-intercept) After that, you'll have your m-value and your b-value. Plug those (only those) into y=mx+b and you'll have the eqn of your perpendicular line.

    • 2 years ago
  2. italian18 Group Title
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    -4, 6

    • 2 years ago
  3. brinethery Group Title
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    Okay, I'll start from here: So you have your point (12,4) and your slope m=3 Plug these values into y=mx+b to get your b-value (y-intercept) 4 = 3*(12) +b b=4- (3)*12=-32 m=4 b=-32 Plug them into y=mx+b and you have the equation of your line. You're not looking for a point. You're finding an equation.

    • 2 years ago
  4. brinethery Group Title
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    Do you know how to plug numbers in to formulas?

    • 2 years ago
  5. italian18 Group Title
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    no

    • 2 years ago
  6. brinethery Group Title
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    Read through this whole thing then. You won't be able to do these problems if you don't know how to graph or plug numbers in. http://tutorial.math.lamar.edu/Classes/Alg/Lines.aspx

    • 2 years ago
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