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3 years ago

(-4x - 7.5 = 3312.5) + (4x + 4y = 2000) (please im in a test rn)

Mathematics

1 answer:

Veronika [31]3 years ago

8 0

Answer:

y= 1330

Step-by-step explanation:

it might be wrong but

-4x -7.5 = 3312.5

4x +4y = 2000 (x cancels out)

4y -7.5 = 5312.5

4y = 5320

y= 1330

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3 years ago

I need to know how to do the answer and why that’s the anwer

Pavel [41]

Ok so the answer is
$4 {x}^{2}$

so we multiply numbers that have the same variable

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$x ^{3} \times x ^{ - 1}$
multipling like this will look like addition.
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6 0

3 years ago

2. 6e-4k - 10 - 4 = 63

snow_lady [41]

Answer:

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Step-by-step explanation:

5 0

2 years ago

Shayla tutors middle school students and high school students. She charges a different rate for each. Last week, she tutored mid

Veronika [31]

Answer:

<em>Shayla charges $20 per hour for middle school students and $25 per hour for high school students.</em>

Step-by-step explanation:

<u>System of Equations</u>

Let's call:

x = Shayla's hourly charge for middle school students

y = Shayla's hourly charge for high school students

Last week, Shayla tutored middle school students for 5 hours and high school students for 12 hours. The total earning was 5x+12y. She earned $400 last week, thus:

5x + 12y = 400 [1]

This week, she tutored middle school students for 6 hours and high school students for 10 hours. The total earnings were 6x+10y and it represented $370, thus:

6x + 10y = 370

Dividing by 2:

3x + 5y = 185 [2]

We have formed the system of equations:

5x + 12y = 400 [1]

3x + 5y = 185 [2]

Multiply [1] by -3 and [2] by 5:

-15x - 36y = -1200

15x + 25y = 925

Adding both equations:

-11y = -275

Dividing by -11:

y = -275/(-11) = 25

y = 25

Substituting in [1]:

5x + 12*25 = 400

5x + 300 = 400

5x = 400 - 300 = 100

x = 100/5 = 20

x = 20

Shayla charges $20 per hour for middle school students and $25 per hour for high school students.

7 0

2 years ago