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3 years ago

5

How do you determine whether to use substitution or elimination. give an example of a system that you would solve using each met

hod?

1 answer:

nadezda [96]3 years ago

3 0

You determine which one to use by seeing which one would be easier

elimination: 5x + 7y = 2
-5x + 6y = 6

substitution: y = 9x + 5
2y = 7x + 2

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125 degrees and 55 degrees

Step-by-step explanation:

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2 years ago

What is the area of this parallelogram

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2 years ago

Calculate cos(480°) and sin(480°).

hram777 [196]

Answer:

$\cos(480^\circ)=-\dfrac{1}{2}$

$\sin(480^\circ)=\dfrac{\sqrt{3}}{2}$

Step-by-step explanation:

Calculate the value of trigonometry function.

$\cos(480^\circ)$ and $\sin(480^\circ)$

Split the angle between 0 to 90° using trigonometry formula.

$\Rightarrow \cos(360^\circ+120^\circ)$

$\Rightarrow \cos(120^\circ)$ $\because \cos(360+\theta)=\cos\theta$

$\Rightarrow \cos(180^\circ-60^\circ)$ $\because 120=180-60$

$\Rightarrow -\cos(60^\circ)$ $\because \cos(180-\theta)=-\cos\theta$

$\Rightarrow -\dfrac{1}{2}$

Therefore, cos(480°) = -0.5

$\Rightarrow \sin(360^\circ+120^\circ)$

$\Rightarrow \sin(120^\circ)$ $\because \sin(360+\theta)=\sin\theta$

$\Rightarrow \sin(180^\circ-60^\circ)$ $\because 120=180-60$

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Therefore, sin(480°) = 0.866

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3 years ago

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2 years ago

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Step-by-step explanation:

use a calculator

and I think that this is right...

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2 years ago