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3 years ago

Which method(s) can be used to solve a system of equations? Select all that apply. distributing

Mathematics

1 answer:

Marina CMI [18]3 years ago

3 0

There are three ways to solve a system of equations: Graphing, substitution, and elimination.

Hope that helps! c:

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Yves bought 420 tropical fish for a museum display. He bought 6 times as many parrotfish as angelfish. How many of each type of

ohaa [14]

The answer would be d , because you have to add how many of each fish to equal up to the sum of 420 . which is x y . so the first equation is x + y = 420 . then it says he bought 6 times as many parrotfish as he did angelfish so you would have to multiply x which represents angelfish by 6 . to get the second equation of y = 6x .

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3 years ago

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If Josie runs a 25-mile race in 5 hours and Greta runs a 18-mile race in 4 hours. Who runs at a FASTER pace?

Genrish500 [490]

Answer:

Josie because 25 miles in 5 hours is 5 miles every hour and Greta runs 4.5 miles evry hour

Step-by-step explanation:

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3 years ago

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What is the corfficient of the variable in the expression 4-3x-7+6

erma4kov [3.2K]

Answer:

-3x+3

Step-by-step explanation:

ion like workin it out but dere you go

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3 years ago

If we know the values of the sine and cosine of x and y, we can find the value of cos(x - y) by using the ____ Formula for Cosin

kolbaska11 [484]

Answer:

$\cos(x - y) = \cos(x)\cos(y) + \sin(x)\sin(y)$

Step-by-step explanation:

Given

$\cos(x - y)$

Required

State the formula

From trigonometry identity, the formula of $\cos(x - y)$ is:

$\cos(x - y) = \cos(x)\cos(y) + \sin(x)\sin(y)$

5 0

3 years ago

Pls help! evaluate the sine of the real number, pls give exact answers

solong [7]

Answer:

$-\frac{\sqrt2}{2} \\$ or exact is −0.70710678...

Step-by-step explanation:

Getting the point!

If we look at the unit circle and we find $-\frac{3\pi }{4}$ we see it is in the 3rd quadrant.
We know that all points in the 3rd quadrant have both negative x and negative y values.
We know that all radians with the base of 4 on the unit circle have the points of $(\frac{\sqrt{2}}{2} ,\frac{\sqrt{2}}{2})$
Because we are in the 3rd quadrant and both x and y are negative we know the point of $-\frac{3\pi }{4}$ is $(-\frac{\sqrt{2}}{2}, -\frac{\sqrt{2}}{2})$

Finding the sin!

Because we know that sin is asking us for the y value
We can just look at the point and find the y value!
the y value is $-\frac{\sqrt2}{2} \\$
Because this fraction does not need to be rationalized we are good!
Use a calculator to find the exact value and you get -0.70710678...
The final answer is $-\frac{\sqrt2}{2} \\$ or exact is −0.70710678...

Hope this helps!! Please mark Brainliest!

4 0

2 years ago