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castortr0y [4]
3 years ago
9

What's 2x+3y=6 and x-3y=9?

Mathematics
1 answer:
Vedmedyk [2.9K]3 years ago
4 0
Set up a system of equations:

2x+3y=6
x-3y=9

You can solve this with elimination by adding the two equations together:

3x+0y = 15
3x=15
x=5

Then, plug this value back into either of the original equations to find the y value:

5-3y=9
-3y=4
y= -4/3

The point of intersection is (5,-4/3)
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Solve this:<br><br>16&lt;x+9 or 18≤x+9​
soldi70 [24.7K]

1) 16 < x + 9

x + 9 > 16

x > 16 - 9

x > 9

2) 18 ≤ x + 9

x + 9 ≥ 18

x ≥ 18 - 9

x ≥ 9

_______

Hope it helps ⚜

5 0
2 years ago
A brother is 3 years older than his sister. Five years ago, the ratio of their ages was 4 : 3. Find the boy age.
Wewaii [24]
17 years old
12:9
12 + 5 is 17
5 0
2 years ago
2 + 3x²y - 1⁄2y + y - 1
Svet_ta [14]

Answer:

3x²y+0.5y+1

Step-by-step explanation:

2+3x²y -0.5y+y -1

2 and -1 is 1

-0.5y and +y is +0.5y so the answer is...

4 0
2 years ago
5. Melanie can run around the track 9 times
Zina [86]

Answer: 3.36

Step-by-step explanation: 75minutes / 28= 2.678571428571429

9/2.678571428571429=3.36 times

3 0
3 years ago
Read 2 more answers
A ball with mass m kg is thrown upward with initial velocity 28 m/s from the roof of a building 17 m high. Neglect air resistanc
Nutka1998 [239]

a. At its maximum height, the ball has zero vertical velocity, so

-\left(28\dfrac{\rm m}{\rm s}\right)^2=2(-g)(y_{\rm max}-17\,\mathrm m)

\implies y_{\rm max}=57\,\mathrm m

b. The ball's height in the air y at time t is given according to

y=17\,\mathrm m+\left(28\dfrac{\rm m}{\rm s}\right)t-\dfrac g2t^2

Solve for t when y=0:

17+28t-4.9t^2=0\implies t\approx6.3\,\mathrm s

3 0
3 years ago
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