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artcher [175]
2 years ago
5

One of the angles of a regular octagon has a measure of (7x-5) What is the value of x?

Mathematics
2 answers:
Nesterboy [21]2 years ago
6 0

Answer:

20

Step-by-step explanation:

Regular octagon means that each angle is 135 degrees, so 135 = (7x - 5).

135 = 7x - 5,

135 + 5 = 7x,

140 = 7x,

140 / 7 = x,

20 = x

SIZIF [17.4K]2 years ago
4 0

Answer:

  x = 20

Step-by-step explanation:

The interior angles of a regular octagon have measures of ...

  180° -360°/8 = 135°

We want that equal to the given expression.

  7x -5 = 135

  7x = 140 . . . . add 5

  x = 20 . . . . . divide by 7

The value of x is 20.

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Answer:

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Step-by-step explanation:

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3 years ago
3x - 4y = 7 , for x <br><br> 15y + 1 = x , for y
Ipatiy [6.2K]
3x - 4y = 7 ; Solve for x

We're essentially just trying to get "x" onto it's own side.

So, in order to do this, we must get "y" onto the other side of our equal sign.

Add 4y to both sides.

3x = 4y + 7

Then, we divide 3 from both sides.

x = 4/3y + 7/3

15y + 1 = x ; Solve for y.

Instead of solving for x, we are now solving for y :)

So, in order to isolate y, we must subtract 1 from both sides.

15y = x - 1

Then, divide both sides by 15.

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4 0
3 years ago
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kondor19780726 [428]

Answer:

b. infinite solutions

Step-by-step explanation:

-\frac{1}{2}x+\frac{1}{2}y=-1\\\\\textsf{subtract} \ -\frac{1}{2}y \ \textsf{from both sides:}\\\\\implies -\frac{1}{2}x=-1-\frac{1}{2}y\\\\\textsf{mulitply both sides by -2:}\\\\\implies x=2+y\\\\\textsf{subtract} \ y \ \textsf{from both sides:} \ x-y=2

Therefore, the graphs are the same.

If the graphs of the equations are the same, then there are an infinite number of solutions that are true for both equations.

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2 years ago
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Answer:

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Step-by-step explanation:

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