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alexdok [17]
3 years ago
6

Find three ordered pairs for x=9

Mathematics
1 answer:
MariettaO [177]3 years ago
8 0
Three examples are (9, 1), (9, -5), and (9, 3.2).
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Which of the following numbers is shown plotted on the number line ?
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-15/7…………………………………………………..
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L -11 l is this an adsolute value question? and how do I solve it ?
polet [3.4K]

Yes, that is an absolute value question. The absolute value of that is 11.

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Write 75 degrees in full form
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Can anyone explain those marked steps in case (iii)
Tema [17]
\cos\dfrac{3x}2=\cos\left(\dfrac\pi2+\dfrac x2\right)
\implies \dfrac{3x}2=2n\pi+\dfrac\pi2+\dfrac x2

follows from the fact that the cosine function is 2\pi-periodic, which means \cos x=\cos(2\pi+x). Roughly speaking, this is the same as saying that a point on a circle is the same as the point you get by completing a full revolution around the circle (i.e. add 2\pi to the original point's angle with respect to the horizontal axis).

If you make another complete revolution (so we're effectively adding 4\pi) we get the same result: \cos x=\cos(4\pi+x). This is true for any number of complete revolutions, so that this pattern holds for any even multiple of \pi added to the argument. Therefore \cos x=\cos(2n\pi+x) for any integer n.

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5 0
2 years ago
Solve the following system of equations by the substitution method. 2x = 10y - 8 3x + 4y + 5 = 0
Natali [406]

Answer:

x = -\frac{41}{19}

y = \frac{7}{19}

Step-by-step explanation:

2x = 10y - 8

3x + 4y + 5 = 0

2x = 10y - 8

x = 5y - 4

3x + 4y + 5 = 0

3 ( 5y - 4 ) + 4y + 5 = 0

19y - 7 = 0

19y = 7

y = \frac{7}{19}

x = 5y - 4

x = 5 ( \frac{7}{19} ) - 4

x = -\frac{41}{19}

5 0
3 years ago
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