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3 years ago

Which is the value of this expression when p = - 2 and q = -1?

Mathematics

1 answer:

Elan Coil [88]3 years ago

4 0

Answer: -4 is the answer

Step-by-step explanation:

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HELP WHAT'S THE ANSWER PLEASE

Vlad [161]

We can start by eliminating y. Seeing as they already have opposite coefficients, no multiplication or division needs to be done. So, add the two equations together. 3.2x + (-1.6x) = 1.6x. 4.2 + 3.4 = 7.6. 0.5y + (-0.5y) = 0. This leaves us with 1.6x = 7.6. Now divide both sides by 1.6 to get x = 4.75.

Now we can eliminate x. Since the coefficients of x are not opposites, we need to multiply the bottom equation by 2 on both sides. That leaves us with -3.2x - y = 6.8. Now we can add both equations together. 3.2x + (-3.2x) = 0. 0.5y + (-y) = -0.5y. 4.2 + 6.8 = 11. This leaves us with -0.5y = 11. Divide both sides by -0.5 to get y = -22.

Therefore the answer is B: (4.75, -22)

8 0

4 years ago

Simplify to create an equivalent expression. 4(−15−3p)−4(−p+5)

Leona [35]

DONE ! Very easy maths

6 0

3 years ago

Read 2 more answers

The graph below shows the number of paintballs a machine launches, y, in x seconds:

IrinaVladis [17]

Answer:

The expression that can be used to calculate the rate per second at which the machine launches the balls is fraction 20 over 4.

Step-by-step explanation:

The x-axis label is Time in seconds, and the x-axis values are from 0 to 20 in increments of 4 for each grid line.

And the y-axis label is Number of Balls and the y-axis values from 0 to 100 in increments of 20 for each grid line.

If the ordered pairs (4,20) and (8,40) are on the graph, then the slope of the line will be represented by

$M = \frac{40 - 20}{8 - 4} = \frac{20}{4}$

Therefore, the expression that can be used to calculate the rate per second at which the machine launches the balls is fraction 20 over 4. (Answer)

5 0

4 years ago

Read 2 more answers

Choose the point-slope form of the equation below that represents the line that passes through the point (−1, 6) and has a slope

Svet_ta [14]

Answer:

3x + y = 3

Step-by-step explanation:

3 0

3 years ago

Give the reason for each statement in the proof. Statements may be used more than once and not all statements will be used.

svlad2 [7]

Answer:

1. Given

2. Given

3. Division property

4. Substitution

5. SSS similarity

Step-by-step explanation:

8 0

3 years ago