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Anastasy [175]
4 years ago
8

How to do a 90 degree counterclockwise rotation?

Mathematics
2 answers:
Luden [163]4 years ago
5 0
Another way to do a 90 degree counterclockwise rotation is to use this rule: (x, y) to (-y, x).

So, you would take each coordinates of the figure and apply this rule.

For example, let's use (5, 7).

The rule is to take the x coordinate and put it on the other side of y, and y becomes negative.

(-7, 5) , and for that point you would plot in the new location in order to perform a 90 degree counter clockwise rotation.
Sophie [7]4 years ago
3 0
First, you chose a point to rotate on. That point stays fixed and then you move the other side of the figure one quarter of a circle to the way that the clock does not go. That point should still be at the same place
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What is the solution to this system of equations?
Eduardwww [97]

Answer:

x = -2, y = 3

Step-by-step explanation:

Given equations are,

4x + 5y = 7 ---------(1)

3x - 2y = -12 ----------(2)

Multiply equation (1) by 3

12x + 15y = 21 ------(3)

Multiply equation (2) by (-4)

-12x + 8y = 48 --------(4)

Now add equations (3) and (4),

(12x + 15y) + (-12x + 8y) = 21 + 48

(12x - 12x) + (15y + 8y) = 69

23y = 69

y = 3

From equation (2),

3x - 2(3) = -12

3x - 6 = -12

3x = 6 - 12

x = -2

Therefore, x = -2 and y = 3 will be the answer.

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4 years ago
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2(10)+5 = 25. The answer is A
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Answer:

The base of the ladder has a length of 8 ft.

Step-by-step explanation:

We have to draw a triangle, as the figure attached.

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The base of the ladder is our unknown quantity X.

We will use the Pythagorean theorem to express the relation between these numbers:

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The base of the ladder has a length of 8 ft.

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