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EleoNora [17]
3 years ago
8

One number added to twice another number is 13. Four times the first

Mathematics
1 answer:
Karo-lina-s [1.5K]3 years ago
6 0
Let's call the first number x, and the second number y. Putting what you have said into equation form:

x+2y=13
\\\\4x+2y=-2


Subtracting one equation from another gives:

x+2y=13 \\-(4x+2y=-2)

\\\\-3x=15
\\x=-5

If x = -5,

x+2y=13
\\(-5)+2y=13
\\2y=18
\\y=9

So the first number is -2, the second number is 9
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Please help I’m about to fail and this quiz will bring my grade up.
konstantin123 [22]

Answer:

first blank: -1

second blank: -7

third blank: -13

fourth blank: - 19

Step-by-step explanation:

hope this helps and please rate my answer!

5 0
3 years ago
If 270°<θ<360°, and tan⁡ θ= - 1/2, what is the value of tan⁡(−θ)?
stiv31 [10]

Check the picture below.

let's recall that once we move an angle in the opposite direction of the 0-line or x-axis, we end up with a negative counterpart angle.

since we know that θ is on the IV Quadrant, then its negative counterpart must be across the line, and tangent is negative on the IV Quadrant, and positive on the I Quadrant.

4 0
4 years ago
Need help with all And have to show work
kari74 [83]
Altho' I can easily guess what you're supposed to do here, I must point out that you haven't included the instructions for this problem.

I'll help you by example.  Let's look at the first problem:

"Evaluate  6(z-1) at z-4."

Due to "order of operations" rules, we must do the work inside the parentheses FIRST.  Replace the z inside (z-1) with "-4".  We obtain

6(-4-1) = 6(-5) = -30 (answer.)

Your turn.  Try the next one.  If it's unclear, as questions.
8 0
3 years ago
Bus A and Bus B leave the bus depot at 7 am.
Art [367]

Answer:

9:30 am

Step-by-step explanation:

We can make a chart and keep filling it in until we see the same time in both columns.

Bus A          Bus B

7:00             7:00

7:30             7:50

8:00            8:40

8:30           9:30

9:00            10:20

9:30

Answer: 9:30 am

We can also use the least common multiple of 30 and 50.

We need to find the smallest number that is a multiple of both 30 and 50.

30 = 2 * 3 * 5

50 = 2 * 5^2

LCD = 2 * 3 * 5^2 = 150

The first time the buses will be at the depot together after 7:00 am is 150 minutes later. 150 minutes = 2 hours 30 minutes.

7:00 am + 2 hours and 30 minutes = 9:30 am

Answer: 9:30 am

3 0
3 years ago
Read 2 more answers
Eh does anyone know this XD
Yuliya22 [10]

Answer:

9/3

Step-by-step explanation:

It's going up by 9 and going right by 3.

Remember it's rise over run.

3 0
3 years ago
Read 2 more answers
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