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3 years ago

Which ordered pair is a solution to the equation 3x-3y=21

Mathematics

2 answers:

guapka [62]3 years ago

5 0

The equation can be simplified: x-y=7
So y=x-7. So only answer option 2 fits the equation (5,-2)

katovenus [111]3 years ago

3 0

The answer would be (5, -2). This is because when you plug in the respective values in for x and y into the equation 3x - 3y = 21, you get 21, which is the desired answer.
3x - 3y = 21
3(5) - 3(-2) = 21
15 + 6 = 21
21 = 21
Hope this helped!

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Step-by-step explanation:

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3 years ago

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A man on the deck of a ship is 14 ft above water level. He observes that the angle of elevation of the top of a cliff is 40 degr

topjm [15]

Answer:

The distance of the ship from the cliff is 38.465 feet

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Step-by-step explanation:

As shown in the figure attached $d$ is the distance from the ship to the cliff, and $h$ is the height of the cliff from the ship.

From trigonometry

$tan(20^o)=\frac{14}{d}$

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$h=d*tan(40^o)=38.465*tan(40^o)=32.28ft$

Ad the height of the cliff is just $14+h$ or

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Which is the height of the cliff.

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3 years ago

Lisa and Jen left home at the same time, only Lisa biked to school at a speed of 10 mph while Jen just walked at a speed of 4 mp

IrinaVladis [17]

Answer:

$\dfrac{1}{6}$ hour or $10$ minutes

Step-by-step explanation:

Lisa:

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$x=10\cdot t$

Jen:

Rate = 4 mph

Time = t hours

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r=rate\to r\%\to \frac{r}{100}\\
t=years\to &17
\end{cases}
\\\\\\
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\\\\\\
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3 years ago

Given m

kenny6666 [7]

Answer:

Step-by-step explanation:

Given, 

m || n

So,

35° = y° [Alternate interior angles]

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Hence, 

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