Anonymous
Anonymous asked in Science & MathematicsMathematics · 2 months ago

which value of r gives the line passing through (3,2) and (r-4) a slope of 3/2?

3 Answers

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  • ?
    Lv 7
    2 months ago

    Surely, your points are (3, 2) and (r, -4)..??

    Slope => (-4 - 2)/(r - 3) = 3/2

    i.e. 2(-4 - 2) = 3(r - 3)

    so, -4 = r - 3

    Hence, r = -1

    :)>

  • 2 months ago

    2 - (-4)

    ______   = 3/2     r = -1

    3 - r

  • Jim
    Lv 7
    2 months ago

    I only remember the Slope Intercept form y =mx + b

    Sub in (3 , 2) to determine 'b':

    2 = 3/2(3) + b

    2 = 9/2 + b

    b = 2 -9/2

    b = 4/2 - 9/2

    b = -5/2

    Now sub in (r -4)

    -4 = 3/2(r) -5/2

    and solve for r

    -4 + 5/2 = 3/2 r

    etc

    r = -1

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