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Tpy6a [65]
3 years ago
15

Solving linear systems graphically

Mathematics
1 answer:
Mekhanik [1.2K]3 years ago
4 0

Answer:

Step-by-step explanation:

You graph both functions and the point where the two lines intersect is ur solution.

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Solve 2cos x+2cos 2x=0 on the interval [0,2pi)
rjkz [21]
2cosx+2cos2x=0 \\ -2sin^2x+2cos^2x+2cosx=0 \\ -2(1-cos^2x)+2cos^2x+2cosx=0 \\ -2+2cos^2x+2cos^2x+2cosx=0 \\ 4cos^2x+2cosx-2=0 \\ t=cos x \\ 4t^2+2t-2=0 \\ \Delta=4+32=36 \\ t_1= \frac{-2-6}{8}=-1 \\ t_2= \frac{-2+6}{8}= \frac{1}{2}  \\ cos x=-1 \lor cos x= \frac{1}{2}    \\ x=-\pi \lor x= \frac{5\pi}{3}
6 0
2 years ago
Read 2 more answers
What are the coordinates of the point that is one half the distance between A(−3, −5) and B(2, 7)?
Olenka [21]

Answer:

(\frac{-1}{2},1)

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right

<u>Algebra I</u>

  • Midpoint Formula: (\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})

Step-by-step explanation:

<u>Step 1: Define</u>

A (-3, -5)

B (2, 7)

<u>Step 2: Find midpoint</u>

  1. Substitute:                    (\frac{-3+2}{2},\frac{-5+7}{2})
  2. Add:                              (\frac{-1}{2},\frac{2}{2})
  3. Divide:                          (\frac{-1}{2},1)
3 0
3 years ago
I don't know how to work this out
Serhud [2]
Hope that helped I use this when I'm doing math. It's called cymath it explain how they got the answer.

8 0
3 years ago
The measure of angle 1 is (10x+8)° and the measure of angle 3 is (12x- 10)°.
12345 [234]

Step-by-step explanation:

option b ie. 98 degree

if you do angle 2 +10x+8=180

from 10x +8 and 12x -10 we can get the value of X

7 0
1 year ago
Need help with this please
Shtirlitz [24]
The ricipricals are 3/8 and 2/13
7 0
3 years ago
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