Answer:
Step-by-step explanation:
By definition, the slope of a line is the change in y values divided by the change in x values. In other words, "rise over run". If you have any two points on a line, use this formula:
(x1,y1) and (x2,y2) are any two points on a line, to find slope (y2-y1)/(x2-x1).
NOTE: (x1,y1) and (x2,y2) are interchangeable, just make sure you are consistent with using a matching ordered pair.
In the form y=mx+b, m is the slope.
Hope this helps!
Hey!
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They already give us the slope, so we can solve the y-intercept.
We can use (3, -2).
y = 8x + b
-2 = 8(3) + b
-2 = 24 + b
-2 - 24 = 24 + b - 24
-26 = b
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Hence, the answer is
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Hope This Helped! Good Luck!
Answer:
Step-by-step explanation:
This is a positive parabola so it opens upwards. The equation for the directrix of this parabola is y = k - p. k is the second number in the vertex of the parabola which is (0, 0), but we need to solve for p.
The form that the parabola is currently in is
so that means that
. We can use that to solve for p in the formula
so
which simplifies to
which gives us that
p = 2. Now to find the directrix:
y = k - p becomes
y = 0 - 2 so
y = -2, choice A.
