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Lilit [14]
2 years ago
9

Y= 3x + 1

Mathematics
2 answers:
Nikolay [14]2 years ago
7 0
Answer: B. -4

When 2 equations equal the same thing (in this case y) we can just re-write the equations this way:

3x + 1 = 2x - 3

Now, just start picking off little numbers that we don’t really need to get the x alone. I don’t like working with negative numbers, so i’ll get rid of the -3 by adding 3 to it. Since anything you do on one side of an equal sign you have to do on the other, i’ll add 3 to 1, which looks like this:

3x + 1 = 2x - 3
+3 +3
3x + 4 = 2x

Now I need to get both x’s on the same side, so i’ll subtract 3x from 3x, then subtract 3x from 2x:

3x + 4 = 2x
-3x -3x
4= -x

Variables should never be negative, and they look complicated too, so in order to make x positive again i’ll swap it’s side with 4. While doing this, remember that swapping sides means you swap 4 to a negative too:

4 = -x
x= -4

And there’s the answer, X equals -4. If you wanted to solve for y, just plug in the x value (which is -4 in this case) to any one of the equations:

y= 3x + 1
y= 3(4) + 1
y= 12+ 1
y= 13

Hope this helped!
SSSSS [86.1K]2 years ago
4 0
It might be C or D im also doing substitution so i don’t really know
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A family has two cats named Gordo and Flaco. Gordo weighs 15 pounds and Flaco weighs 8 pounds. A cat’s weight is classified as u
Elena-2011 [213]

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Gordo's weight makes Gordo unhealthy.

Step-by-step explanation:

μ = mean weight = 9.5 pounds

σ = standard deviation = 1.5 pounds

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Let the z-score for this limit be z'

P(z < z') = 0.05

From the normal distribution table,

z' = -1.645

And the limit for the top 5% which is z" = 1.645.

The weight that corresponds to these scores are then calculated.

Standardized scores are given as

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So,

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Therefore the healthy weight range for cats is (7.033 < x < 9.968)

Gordo's weight = 15 pounds

It is outside the healthy weight range and is in the top 5% of weights of cats.

Gordo's weight makes the cat unhealthy.

Flaco's weight = 8 pounds

Flaco's weight lies in the healthy weight range for cats. Hence, Flaco is a healthy cat.

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2 years ago
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