1) Which of the following equations has a solution of -4? Choose all that apply.

Mathematics

1 answer:

tatiyna3 years ago

4 0

A. It’s the only one I could think of the other one didn’t work

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Please please helpppp.

padilas [110]

There are 3 ways of solving a simultaneous problem, substitution method, elimination method and Gauss-Jordan method. I'm gonna use the substitution method since it's easier and i think it would suit your level more.

First let's try solving for y since it's easier to start with.

Firstly we have to find an equation for x:

$x-2y=2\\x-2y+2y=2+2y\\x=2+2y$

Great, now we can use the substitution method to find the value of y using the first equation:

$2x+3y=11\\2(2+2y)+3y=11\\4+4y+3y=11\\7y=7\\y=1$

Now we know that y=1 we can solve the first equation we made:

$x=2+2y\\x=2+2(1)\\x=4$

And the answer is $x=4 , y= 1\\(4,1)$

Double check:

$2x+3y=11\\2(4)+3(1)=11\\8+3=11\\11=11\\\\x-2y=2\\(4)-2(1)=2\\2=2$

And that's our final answer! (4,1)

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3 years ago

Which of the following is not a security alliance that the US belongs to?

dimulka [17.4K]

The security alliance that the US does not belong to is..

D. Lisbon Treaty

Hope this helped! :)

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3 years ago

Read 2 more answers

If someone used 1/4 of an ounce of nuts to make 1/12 of a recipe of cookies , how many ounces of nuts will she need to make one

statuscvo [17]

1/3 multiplied by 1/4

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3 years ago

Suppose P(E) = 81%; P(E and F) = 9%; and P(E or F) = 65%,

PIT_PIT [208]

Using Venn probabilities, it is found that P(F) = -0.07, which is not a probability, as it is a negative value.

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We have two events, E and F.
Their probabilities are: $P(E) = 0.81, P(E \cap F) = 0.09, P(E \cup F) = 0.65$
The probabilities are related by the following equation: