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September 18th, 2009, 06:45 PM   #1
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I need help on a few slope questions

If someone can help me out with this it'd be greatly appreciated, thanks!!

1. If a line has an undefined slope, it is parallel to a line that has zero slope. true, false, neither

2. When slope m > 0, the line is the graph of a?

3. Given y = mx + b where does the line cross the y-axis?

4. Find the point-slope form of a line with slope m = 2 that passes through the point
(-1, 3).

5. Find the slope-intercept form of a line with a slope m = 3 that passes through the
point (0, 2).
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September 18th, 2009, 07:11 PM   #2
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Re: I need help on a few slope questions

1. False. It is perpendicular.

2. Linear function of x. (increasing)

3. At b. This is the y value when x = 0.

4. Point-slope form of the equation of a line: y - y_1 = m(x - x_1) ? y_1 = 3 ? x_1 = -1 ?y - 3 = 2(x +1).
Slope = (y - y_1)/(x - x_1).

5. Slope-intercept form of the equation of a line: y = mx + b ? y = 3x + b ?2 = 3(0) + b ?b = 2 ?y = 3x + 2.
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September 18th, 2009, 07:33 PM   #3
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Re: I need help on a few slope questions

thanks but for question 2 the choices i have are below, so which would it be?

a. constant function
b. decreasing function
c. increasing function
d. not a function
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September 18th, 2009, 07:36 PM   #4
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Re: I need help on a few slope questions

The answer would be "c" because as we move along the x-axis to the right the value of y is increasing, that is, as x increases, y increases.
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September 18th, 2009, 07:48 PM   #5
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Re: I need help on a few slope questions

thanks, and thanks for explaining it rather than just answering it and me still having no clue how to work these problems
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