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3 years ago

How can you tell if (4,7) is a solution

Mathematics

2 answers:

Diano4ka-milaya [45]3 years ago

6 0

you have to plug it into your equation

Dafna1 [17]3 years ago

6 0

Answer:

In order to check if the x and y value is a solution then you need to plug in your numbers for the x and why value.

Take this as an example with your solution (4,7) let's try 4x-9=y. We want to plug in the values of each variable so the new equation will look like 4(4)-9=(7). Now you want to multiply and get 16-9=7 next subtract and you get 7=7. This would be a solution for the problem.

Now we can try 3x+14=y do the same thing from last example and you'll get 3(4)-14=7 and now multiply to get 12-14=7 now subtract and you'll get -2=7 which is NOT a solution to this equation so it would become -2≠7.

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3 years ago

Read 2 more answers

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Answer:

Current speed is 40mph

Step-by-step explanation:

We firstly need to know what is intended by upstream and downstream. When the boat travels in the direction of the current (horizontal movement of the water), we say it is moving downstream otherwise it is moving upstream.

Let's assume the speed of the boat is A and that of the current is B, then the speed when it moves dowstream would be A + B and the speed if it moves upstream would be A – B.

In this question, we know that the speed of the boat is 40mph. Given that it takes the same time to travel 8miles upstream as it does to travel 24miles downstream, we have

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Speed downstream = 40 + X

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(40 + x)/3 = (40 – x)/1

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120 – 40 = 3x – X

2x = 80

X = 40.

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