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GalinKa [24]
4 years ago
12

What is the solution to this linear equation? y-4x=7 2y+4x=2

Mathematics
1 answer:
Phantasy [73]4 years ago
5 0
You can solve for y in the first equation

y = 4x + 7

Plug 4x + 7 instead of y in the second equation

2(4x + 7) + 4x = 2

Solve for x

x = -1

Plug -1 for x

y - 4 * -1 = 7

y = 3

Solution: (-1, 3)
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20 out of 25 students were 15 y/o, what percentage of the students is 15 ?
zalisa [80]

Answer:

80% are 15 years old

Step-by-step explanation:

To find the percent , we need to know how many out of 100

20/25

Multiply the top and bottom by 4

20*4

-----------

25*4

80/100

This is 80%

80% are 15 years old

4 0
3 years ago
Read 2 more answers
Please help me with this question.
padilas [110]
It would be: = 56 1/4 % = 225/4% = 225/4/100 = 225/400 = 9/16

In short, Your Answer would be 9/16

Hope this helps!
6 0
4 years ago
Number 46 please help
Sati [7]
2/3 = 8/12

5 1/4 = 21/4 = 63/12

63 divide by 8 is 7.875

7 batches should be your answer

hope this helps
3 0
3 years ago
Its for a test and its urgent please help :)
geniusboy [140]

Answer:

<h2>34</h2><h2 />

Step-by-step explanation:

| 2 - 4a | - 2(b - 7)

let a = 3, b = -5

substitute a = 3, b = -5 into the equation:

| 2 - 4a | - 2(b - 7)

= | 2 - 4(3) | - 2(-5 - 7)

= | 2 - 12 | - 2(-12)

= | -10 | + 24

= 10 + 24

= 34

3 0
3 years ago
What is the score range for the smallest percent of students
andre [41]
<h2>Answer:</h2>

The score range for the smallest percent of students is:

                         400 to 700

<h2>Step-by-step explanation:</h2>

From the pie chart or circle graph that is provided to us the smallest percent of the students are 10%

( Since 10%  is smallest among 14%,42%,34% and 10%)

and we may observe that the smallest region is denoted  or represented by the dark blue region and the range of the score of blue region that is given to us is:

                  400 to 700

   Hence, the answer is:

                   400 to 700

8 0
3 years ago
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