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viva [34]
3 years ago
13

Solve the equation. 5x – 7 = 3x – 9 –2 2 –1 0

Mathematics
2 answers:
irga5000 [103]3 years ago
3 0

Answer:

x= -1

Step-by-step explanation:

kaheart [24]3 years ago
3 0

Answer:

x = -1

Step-by-step explanation:

5x - 7 = 3x - 9

5x - 3x = -9 + 7

2x = -2

x = -1

Hope this helped!

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If (cos)x= 1/2 what is sin(x) and tan(x)? Explain your steps in complete sentences.
Natasha_Volkova [10]
The correct answers are:
1) sin(x) = \frac{ \sqrt{3} }{2}
2) tan(x) = \sqrt{3}

Explanation:
Given:
cos(x) =  \frac{1}{2}

Step 1:
Since, according to the Trigonometric identity:
sin^2(x) + cos^2(x) = 1 -- (1)

Step 2:
Plug in the value of cos(x) in equation (1):
sin^2(x) + ( \frac{1}{2} )^2 = 1 \\ sin^2(x) + \frac{1}{4} = 1 \\ sin^2(x)  =  \frac{3}{4}

Step 3:
Take square-root on both sides:
\sqrt{sin^2(x)} =  \sqrt{\frac{3}{4}}

sin(x) = \frac{ \sqrt{3} }{2}

Now to find the tan(x), we would use the following formula:

tan(x) = \frac{sin(x)}{cos(x)} --- (2)

Plug in the values of sin(x) and cos(x) in equation (2):
tan(x) = \frac{ \frac{ \sqrt{3} }{2} }{ \frac{1}{2} }

Hence tan(x) = \sqrt{3}
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3 years ago
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Which of the following is an example of a system of three linear equations in theee variables
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20 POINTS<br> HELP ME PLEASE<br> How many solutions does the system have
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Answer:

Two

Step-by-step explanation:

x² + 4 = 4x + 1

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Two solutions: (1,5) (3,13)

3 0
3 years ago
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