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2 years ago

Help plz, i would be so happy if you did nobody's been answering my questions lately :(

Mathematics

2 answers:

Vlada [557]2 years ago

8 0

Answer:

-5x + y = 7

x+3y = 5

Step-by-step explanation:

when you graph the equations, they are parallel. as you know, solutions are the point where the lines meet. if they are parallel, it's not possible for the lines to intersect.

maria [59]2 years ago

8 0

Answer and Step-by-step explanation:

Lets solve each one and see which has solutions and which one doesn't have a solution.

__________________________________________________________

A) x + y = -6

x + y = 12

Solve for y for one of the equations, then plug it into the other equation.

y = -6 - x

x + (-6 - x) = 12 = -6 = 12 No Solution

__________________________________________________________

B) y = 2x + 5

y = -3x + 1

2x + 5 = -3x + 1

4 = - 5x

$-\frac{4}{5} =x$ Solution

_________________________________________________________ C) y = 4x - 8

y = 2x - 4

4x - 8 = 2x - 4

2x = 4

x = 2 Solution

__________________________________________________________

D) -5x + y = 7

x + 3y = 5

x = 5 - 3y

-5(5 - 3y) + y = 7

-25 + 15y + y = 7

16y = 32

y = 2 Solution

__________________________________________________________

So, A is the correct answer. Sorry for the late answer!

#teamtrees #WAP (Water And Plant)

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2 years ago

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2 years ago

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otez555 [7]

Answer:

Step-by-step explanation:

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3 years ago

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andreev551 [17]

sin

−

Explanation:

Imagine we have a point

with Rectangular (also called Cartesian) coordinates

(

)

and Polar coordinates

(

)

The following diagram will help us visualise the situation better:

https://keisan.casio.com/exec/system/1223526375

We can see that a right triangle is formed with sides

and

, as well as an angle

We have to find the relation between the Cartesian and Polar coordinates, respectively.

By Pythagora's theorem, we get the result

The only properties we can say about

are its trigonometric functions:

sin

⇒

sin

cos

⇒

cos

So we have the following relations:

⎧

⎪

⎨

⎪

⎩

sin

cos

Now, we can see that saying

−

in the Rectangular system is equivalent to say

sin

−

Answer link

Jim G.

May 19, 2018

−

sin

Explanation:

to convert from

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∙

cos

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⇒

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⇒

−

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2 years ago

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netineya [11]

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