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4 years ago

If ABC is reflected across the y-axis, what are the coordinates of A? A (1-3)

Mathematics

1 answer:

aalyn [17]4 years ago

3 0

Answer:

d. (-1, 3)

Step-by-step explanation:

Reflecting across y axis means the x coordinate will change.

Imagine a mirror image of the triangle on the other side of Y axis.

A's coordinates on the right are (1, 3)

So if we flip across Y the coordinates will now be (-1, 3)

3 stays the same because it is still in the same position vertically.

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Identify the coordinate of the point (-7,-5) under a rotation of 180° clockwise about the orgin

dolphi86 [110]

$P(x,y)\xrightarrow{\text{rotation(origin,180)}}P'(-x,-y)\\\\
P(-7,-5)\xrightarrow{\text{rotation(origin,180)}}P'(7,5)
$

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3 years ago

How to solve this problem im not getting a good answer

kow [346]

Well, you have to simplify the bottom part to be able to answer it as a whole number. Hope this helps.

7 0

4 years ago

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Solve the system by using the inverse of the coefficient matrix. -3x + 9y = 9 3x + 2y = 13 Group of answer choices

kirill [66]

Answer:

x= 3

y=2

Step-by-step explanation:

-3x + 9y = 9 ----------- equation 1

3x + 2y = 13--------------- equation 2

In Matrix Form

$\left[\begin{array}{cc}-3&9\\3&2\end{array}\right] \left[\begin{array}{c}x\\y\end{array}\right] = \left[\begin{array}{c}9\\13\end{array}\right]$

Let A = $\left[\begin{array}{cc}-3&9\\3&2\end{array}\right]$ X = $\left[\begin{array}{c}x\\y\end{array}\right]$ and B = $\left[\begin{array}{c}9\\13\end{array}\right]$

Then Mathematically AX= B

or X= A⁻¹ B

Where A⁻¹ = Adjacent A/ mod of A

Adjacent A = $\left[\begin{array}{cc}2&-9\\-3&-3\end{array}\right]$

Mod Of A= -6 - (27) = -33 which is not equal to zero

so Putting These values in the given formula

X= 1/-33 $\left[\begin{array}{cc}2&-9\\-3&-3\end{array}\right]$ $\left[\begin{array}{c}9\\13\end{array}\right]$

Now Multiplying Rows and Columns

$\left[\begin{array}{c}x\\y\end{array}\right]$ = -1/33 $\left[\begin{array}{cc}2*9+- 9*13\\-3*9 +- 3*13\end{array}\right]$

Solving the Matrix we get

$\left[\begin{array}{c}x\\y\end{array}\right]$ = -1/33 $\left[\begin{array}{cc}18-117\\-27-39\\\end{array}\right]$

$\left[\begin{array}{c}x\\y\end{array}\right]$ = -1/33 $\left[\begin{array}{cc}-99\\-66\end{array}\right]$

From Here we find x= 99/33 or 3

and y = 66/33= 2

4 0

3 years ago

If 25% of a number, n, is 6.25, what is 42% of n?<br> A.10.50<br> B.2.625<br> C.1.5625<br> D.5.250

miss Akunina [59]

Answer:

The answer is probably 10.50

(sorry if im wrong)

Step-by-step explanation:

7 0

3 years ago

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BRAINLEIST ANSWER TO WHOEVER GIVES ME CORRECT ANSWER FIRST

ivann1987 [24]

Great, because y=2x+5 is 3xy kay.

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3 years ago