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4 years ago

Help ASAP please! Really am struggling with this topic

Mathematics

2 answers:

Travka [436]4 years ago

7 0

I dont have an answer buy i need to answer a question so i can ask my question sry

SpyIntel [72]4 years ago

7 0

Answer:

Slope for the first would be 3 and the y intercept is 1. For the second the slope is -4 and the y intercept is 140.

Step-by-step explanation:

For the first one the difference between the first second point is up 6 and over 2 so 6/2= 3 or slope and the y intercept is just where the line intersects the y axis.

For the second question the difference between the points is down 20 units and over 5 so -20/5= slope of -4, and the line intersects the y axis at 140 so that is the y intercept.

If the x value is zero then the y value is the y intercept.

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Answer:

If you aren't looking for the quadratic solving method then comment it down below and tell me what you're looking for

QUADRATIC EQUATION

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4 years ago

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3 years ago

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3 years ago

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Derive the equation of the parabola with a focus at (0, −4) and a directrix of y = 4.

CaHeK987 [17]

<u>Answer:</u>

$y=-\frac{1}{16} x^2$

<u>Step-by-step explanation:</u>

Equation of parabola with focus at (0,-4) and directrix is $y=4$ .

We know that parabola is the locus of all the points such that the distance from fixed point on the parabola to fixed line directrix is the same.

The parabola is opening downwards.

Let any point on parabola is (x,y).

Distance from focus(0,-4) to (x,y) = $\sqrt{(x-0)^2+(y-(-4))^2}=|y-4|$

$\sqrt{(x-0)^2+(y-+4)^2}=|y-4|$

$(x-0)^2+(y+4)^2=(y-4)^2$

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$x^2+(y^2+4y+4y+16)=y^2-4y-4y+16$

$x^2+y^2+8y+16=y^2-8y+16$

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$16y=-x^2$

$y=-\frac{1}{16} x^2$

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2 years ago

Mrs. Potts is putting a fence around her rectangular garden the length of the garden is 8 yards the width of the garden is 4 yar

Varvara68 [4.7K]

Answer:

Mrs. Potts needs 72 feet of fencing.

Step-by-step explanation:

You find the perimeter of the rectangular garden, which is 24 yards. You then convert the yards to feet. There are 3 feet in a yard. You multiply 24 by 3 to get your final answer of 72 feet.

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3 years ago