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2 years ago

-x - 4y = 16 find value of y when x equals -8

Mathematics

2 answers:

pashok25 [27]2 years ago

8 0

The answer is -2......

mixas84 [53]2 years ago

3 0

In -x - 4y = 16, the value of y when x equals -8 is -2.

-(-8) - 4y = 16
8 - 4y = 16
-4y = 8
y = -2

Hope this helps!

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What is the slope of the line threw (-7,-2) and (-6,7)

miv72 [106K]

Answer:

Step-by-step explanation:

To find the slope of a line, calculate the distance between points with a ratio of vertical to horizontal distance. This is done using the formula:

$m=\frac{y_2-y_1}{x_2-x_1}$

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$m=\frac{7--2}{-6--7}=\frac{7+2}{-6+7}=\frac{9}{1}=9$

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3 years ago

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2 years ago

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2 years ago

Write an equation for a circle with a diameter that has endpoints at (–10, 1) and (–8, 5). Round to the nearest tenth if necessa

satela [25.4K]

The standard form for the equation of a circle is :

(x−h)^2+(y−k)^2=r2 ----------- EQ(1)
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So the midpoint of the diameter with endpoints at (−10,1)and(−8,5) is :

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Now, use the distance formula to find the radius of the circle:

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2 years ago

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gizmo_the_mogwai [7]

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The formula of margin error

$\frac{2\sqrt{p(1-p)} }{\sqrt{n} } = 0.02$ … ( i )

Substitute 'p' values in equation (1)

$\frac{2\sqrt{0.22(1-0.22)} }{\sqrt{n} } = 0.02$

cross multiplication and simplification, we get

$2X0.414= 0.02 \sqrt{n}$

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2 years ago