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r-ruslan [8.4K]
3 years ago
9

HELP PLEASE!!!!❕❕❕write in standard form an equation of the line slope= 2/5;(-1,3)

Mathematics
2 answers:
Vinil7 [7]3 years ago
7 0

Answer: 2x - 5y = -17

Step-by-step explanation: Let's use the point-slope formula.

The point-slope formula is written y - y₁ = m(x - x₁).

In this formula, (x₁, y₁) is our point and <em>m</em> is our slope.

Now let's plug all our information into the formula.

So we have y - 3 = 2/5(x + 1).

Notice that I put x + 1 inside the parenthses and this

is because we have x minus a negative 1 which means x + 1.

Our next step would be to distribute this 2/5through both

terms inside the parenthses to get 2/5x + 2/5 on the right side.

So we have y - 3 = 2/5x + 2/5.

Now in standard form, we cannot have any fractions.

We need to get rid of them by multiplying

both sides of the equation by 5.

When we do this, we get 5y - 15 = 2x + 2.

Now we just move our number to the right by

adding 15 to both sides of the equation.

That gives us 5y = 2x + 17.

Move our 2x to the left side by subtracting

2x from both sides to get -2x + 5y = 17.

In standard form, the coefficient of the x term must be positive.

So our last step is to divide both sides

by -1 so that our answer is 2x - 5y = -17.

Anika [276]3 years ago
3 0

Answer:

2x-5y = -17

Step-by-step explanation:

Using point slope form

y-y1 = m(x-x1)

where m is the slope and (x1,y1) is the point on the line

y-3 = 2/5(x- -1)

y-3 = 2/5(x+1)

Multiply each side by 5 to clear the fraction

5(y-3) = 5* 2/5(x+1)

Distribute

5y-15 = 2x+2

Standard form is Ax + By = C  where A is a positive integer and B and C are integers

Subtract 5y from each side

-15 = 2x-5y +2

Subtract 2 from each side

-17 = 2x-5y

2x-5y = -17

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Which of these is NOT equivalent to 2^-3
Neporo4naja [7]
The question is asking which of the answer choices is NOT equivalent to
  2^-3 = 1/(2^3) = 1/8

You can determine this by expressing each of the answer choices in a manner that lets you compare them to 2^-3 or to 1/8.

A. -2^3 = -8 . . . . . this is not equivalent to 2^-3 or 1/8. This is the appropriate selection.

_____
Let's check the others, just to be sure.
B. 2(1/4)^2 = 2(1/16) = 2/16 = 1/8 . . . . is equivalent to 1/8

C. 2^2 × 2^-5 = 2^(2-5) = 2^-3 . . . . is equivalent to 2^-3

D. (1/2)^3 = 1/2^3 = 1/8 . . . . is equivalent to 1/8

Our choice of A is correct, as all these other choices are equivalent to the given expression.
3 0
3 years ago
The Answer is NOT 2.5 PLEASE HELP!!​
lesya692 [45]
Maybe try -2/5? I don’t really know-
5 0
3 years ago
Read 2 more answers
Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places
Montano1993 [528]

The solution of the given equation is :

cosθ = 1/2 when θ = π/3 + 2kπ or 5π/3 + 2kπ

cosθ = -1 when θ = π + 2kπ

Since cos2θ + sin2θ = 1, sin2θ = 1 - cos2θ

So, the given equation is equivalent to 2(1 - cos2θ) - cosθ = 1

-2cos2θ - cosθ + 1 = 0

2cos2θ + cosθ - 1 = 0 (multiplying the entire equation by -1)

(2cosθ - 1)(cosθ + 1) = 0 (taking common)

cosθ = 1/2 or cosθ = -1 (on equating it to zero)

cosθ = 1/2 when θ = π/3 + 2kπ or 5π/3 + 2kπ

cosθ = -1 when θ = π + 2kπ

For more information about trigonometric ratios, visit

brainly.com/question/24496175

3 0
2 years ago
A chestnut falls out of a tree 45 feet above the ground. Use the vertical motion model, H=-16t^2+vt+s s to find how long it take
valentinak56 [21]

Answer:

1.7 seconds

Step-by-step explanation:

we have

H=-16t^2+vt+s

where

v is the initial velocity (in feet per second)

s represents the initial height (in feet)

In this problem we have

v=0 ---> because the object is dropped

s=45\ ft

substitute

H=-16t^2+45

Remember that

When the chestnut hit the ground the value of H is equal to zero

so

For H=0

-16t^2+45=0

solve for t

16t^2=45\\t^2=2.8125\\t=\pm1.7\ sec

therefore

The solution is t=1.7 sec

7 0
3 years ago
Is 12 a solution to the equation × - 8 = 20? Explain how you know.
jeyben [28]

We have the following:

x-8=20

solving for x

\begin{gathered} x=20+8 \\ x=28 \end{gathered}

The solution of x is equal to 28, therefore 12 is not a solution of the equation

5 0
1 year ago
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