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3 years ago

Use the slope y-intercept to graph the equation. y=-4/5x+4

Mathematics

1 answer:

yulyashka [42]3 years ago

6 0

This should be right that’s if I did it right

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fenix001 [56]

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3 years ago

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Wewaii [24]

Answer:

X=3

Step-by-step explanation:

4x-12+1=1

4x=1-1+12

4x=12

x=12/4

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3 years ago

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3 years ago

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3 years ago

5+ 3 cos ½x = 7<br>how to find the x?

Anon25 [30]

Answer:

$x=\pm 2 arcos(\frac{2}{3})+4k\pi$

where $k$ is an integer

Step-by-step explanation:

$5+3\cos(\frac{1}{2}x)=7$

We are going to isolate the trig expression first.

Subtract 5 on both sides:

$3\cos(\frac{1}{2}x)=2$

Divide both sides by 3:

$\cos(\frac{1}{2}x)=\frac{2}{3}$

Now since $\cos(u)$ is even then $\cos(u)=\cos(-u)$ .

So we have:

$\cos(\frac{1}{2}x)=\frac{2}{3}$

implies:

$\frac{1}{2}x=arccos(\frac{2}{3})+2k\pi$

Multiply both sides by 2:

$x=2arccos(\frac{2}{3})+4k\pi$

$-\frac{1}{2}x=arcos(\frac{2}{3})+2k\pi$

Multiply both sides by -2:

$x=-2arccos(\frac{2}{3})-4k\pi$

So we can say the solution is:

$x=\pm 2arcos(\frac{2}{3})+4k\pi$

( $k$ is an integer)

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3 years ago