All categories

3 years ago

If 2x +y=8, x+2y=4, find the value of x-y. Please, help me

Mathematics

1 answer:

kifflom [539]3 years ago

8 0

y = 8 -2x

x + 2 (8 - 2x) = 1

x + 16 - 4x = 1

x - 4x = -15

-3x = -15

x = 5

If x = 5, then we can substitute in...

5 + 2y = 1

2y = -4

y = -2

Now let us check that by substituting those values in to the equation

2x + y = 8

2 (5) + (-2) = 8

That is correct so we have the right values for x and y/

You might be interested in

How many digits are in the repetend of the decimal expansion for 2/41

AleksandrR [38]

Answer:

0.0487804878

Step-by-step explanation:

the answer will be 5 because it starts at 0.

5 0

2 years ago

Which line has a constant of proportionality between y and x of 1/2?

Gnesinka [82]

Answer:

It's line C.

Step-by-step explanation:

the slope of line C is 1/2 so that's the constant of proportionality

6 0

2 years ago

Can someone please explain to me how to solve these types of equations? I'm supposed to solve for x in 4^(-5x-6)=4^(9x+4)

Ksenya-84 [330]

Answer:-5/7 i think that is wrong

Step-by-step explanation:

8 0

2 years ago

Hey answer this pls!!

Kitty [74]

Answer:

That would be A) -3/5.

Step-by-step explanation:

Here it is.

6 0

2 years ago

Assume that instead of conducting experiments, Latané and Darley had used a correlational method to study the relation between t

Len [333]

Answer:

C) a positive correlation

Step-by-step explanation:

More people ⇒ Longer time is a positive correlation between those variables. However, longer time is not the desired outcome.

Rather, shorter time is the desired outcome. The correlation between more people and shorter time is negative. In order to compute that correlation numerically, one would have to define a function that would give a numerical value for "shorter time" that would model the goodness of outcome as time gets shorter.

7 0

2 years ago