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2 years ago

What is the value of 2x - 3y, if x = 2 and y=-1?

Mathematics

2 answers:

Naya [18.7K]2 years ago

4 0

Answer:

Step-by-step explanation:

Substitute 2 for x and -2 for y

2(2) - 3(-1)

4 - -3 = 7

Inessa [10]2 years ago

3 0

Answer:

Step-by-step explanation:

I) Construct an expression to find the answer:

2(2) - 3(-1)

II) Simplify/Solve:

2(2) - 3(-1)

= 4 - (-3)

= 7

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Answer:

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3 years ago

Suppose y varies inversely with X, and y = 48 when x = 3. What is the value of x when y = 24?

olganol [36]

Answer:

C. 6

Step-by-step explanation:

Recall that inverse variation is given by:

$\displaystyle y=\frac{k}{x}$

Where k is the constant of variation.

We know that y = 48 when x = 3. Substitute:

$\displaystyle (48)=\frac{k}{(3)}$

Solve for k:

$k=3(48)=144$

Hence, our equation is:

$\displaystyle y=\frac{144}{x}$

We want to find x when y = 24. Substitute:

$\displaystyle \frac{24}{1}=\frac{144}{x}$

Cross-multiply:

$24x=144$

Divide both sides by 24. Hence:

$x=6$

Our answer is C.

3 0

3 years ago

The depth of a lake, d, varies directly with r, the amount of rainfall last month. if k is the constant of variation, write an e

irina1246 [14]

Answer:
d = kr

Explanation:
We know that the depth (d) varies directly with the amount of rain (r).
This means that as the amount of rain increases, the depth increases and vice-versa.
The depth would depend on r multiplied by a constant of variation (k)

Translating this into equation, we would get the following:
d = kr

Hope this helps :)

4 0

3 years ago

I need the measure of angle 3

blsea [12.9K]

Answer:

79°

Step-by-step explanation:

Since, 101° and angle 3 are interior angles falling on the same side of transversal.

Therefore,

$101 \degree + m \angle \: 3 = 180 \degree \\ \\ m \angle \: 3 = 180 \degree -101 \degree \\ \\ m \angle \: 3 = 79 \degree$

7 0

2 years ago

What is the value of 2x - 3y, if x = 2 and y=-1?​

What is the value of 2x - 3y, if x = 2 and y=-1?