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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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Simora [160]

(a) From the histogram, you can see that there are 2 students with scores between 50 and 60; 3 between 60 and 70; 7 between 70 and 80; 9 between 80 and 90; and 1 between 90 and 100. So there are a total of 2 + 3 + 7 + 9 + 1 = 22 students.

(b) This is entirely up to whoever constructed the histogram to begin with... It's ambiguous as to which of the groups contains students with a score of exactly 60 - are they placed in the 50-60 group, or in the 60-70 group?

On the other hand, if a student gets a score of 100, then they would certainly be put in the 90-100 group. So for the sake of consistency, you should probably assume that the groups are assigned as follows:

50 ≤ score ≤ 60   ==>   50-60

60 < score ≤ 70   ==>   60-70

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Can someone help me?
kirza4 [7]

Answer:

C. -36 3/10

Step-by-step explanation:

4 2/5 = 22/5

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4.4(-8.25)

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Have a great day :3

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