MATHEMATICS MIDDLE SCHOOL

A student uses the substitution method to solve the system of equations below algebraically.2x - y = 5
3x + 2y = -3

Which equation could be used?

Answers

Answer 1
Answer:

Answer:

Step-by-step explanation:

He could use either.  It would probably be better to use one that already has a variable without a coefficient.  which one has that?  Let me know if that doesn't make sense.  

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The possible values of x are given by x + 8 < 6. what is the greatest possible value of 7x?

Answers

Final answer:

Given the inequality x + 8 < 6, it follows that x < -2. When 7 is multiplied by -2, this results in -14. This represents the greatest value of 7x.

Explanation:

The student is asking for the greatest possible value of 7x given the inequality x + 8 < 6. Solving for x, we see that x is less than -2. In other words, x < -2. Sets formed by inequalities are continuous, meaning they include an infinite number of points. In this case, x could hypothetically reach towards negative infinity.

However, if we substitute x = -2 in the equation of 7x, the value would be -14. And if x continues to decrease (as it's less than -2), the value of 7x likewise continually decreases. Therefore, the greatest possible value of 7x in this context is -14 (which happens when x is -2).

Learn more about inequality and maximum value here:

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Final answer:

To find the greatest possible value of 7x, we need to determine the possible values of x based on the given inequality x + 8 < 6. The greatest possible value of 7x occurs when x is the smallest it can be, which is -2. Therefore, the greatest possible value of 7x is -14.

Explanation:

To find the greatest possible value of 7x, we first need to determine the possible values of x based on the given inequality x + 8 < 6.

Subtracting 8 from both sides of the inequality, we get x < -2.

Therefore, x can take any value less than -2. In this case, the greatest possible value of 7x would be when x is the smallest it can be, which is -2.

So, the greatest possible value of 7x is 7*(-2) = -14.

Learn more about Inequalities here:

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What is the probability that a random selected citizen of Canada will speak either English or French

Answers

Answer:

3 out of 10

Step-by-step explanation:

Answer:

4/10 im not sure why this is a mathmadics but ok

Step-by-step explanation:

What is -2 square root of 36 x 9

Answers

\sf-2√(36)*9

Simplify the square root:

\sf-2*6*9

Multiply:

\sf-108

(-2/3)/(-1/2) = ? I dont know how to work this out.

Answers

I believe the answer is 1/3

Lyle can paint a room in 3 hours. Selena can paint a room with the same dimensions in 2 hours. If they work together, how many hours does it take them to paint the room? Round your answer to the nearest tenth?

Answers

The rate at which they paint together is 1 room per two hours plus one room per three hours. (1/2)+(1/3) = (3/6)+(2/6) = (5/6) hours, or 50 minutes.

Number 6. I have no idea how to do this because the question doesn’t give enough information

Answers

{13}^(2) = {5}^(2) * {b}^(2) \n 169 = 25 * {b}^(2) \n 165 - 25 = {b}^(2) \n 144 = {b}^(2) \n \sqrt{ {b}^(2) } = √(144) \n b = 12
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