X + y = 40.....multiply by -4
4x + 6y = 180
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-4x - 4y = -160 (result of multiplying by -4)
4x + 6y = 180
------------------add
2y = 20
y = 20/2
y = 10 <===
x = 30
I'm not sure how to give you solid proof, like an equation or something, but you can see that out of the four coordinates, two of them have the y-value of 4 and two of them have the y-value of 2. Also, there is 1.5 in between each x-value that is paired with the same y-value... if that makes sense. So for (0.5, 2) and (3, 2), there is 1.5 in between 0.5 and 3. I hope this helps! Sorry it's a bit of a weird answer
The amount of money found under the couch cushion is $1.99
<h3>
Answer: C) I and II only</h3>
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Work Shown:
Part I

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Part II

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Part III

Answer:

Step-by-step explanation:
Distance covered by the train in crossing the pole = 100 m.






- Hence, the speed of the train is 72 km/h