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jasenka [17]
3 years ago
5

Write an equation of the line with the same slope as the line given by 5x + 2y = 8 and the same y-intercept as the line given by

3x - 7y = 10
Mathematics
1 answer:
kaheart [24]3 years ago
8 0
In y = mx + b form, the slope is in the m position and the y intercept is in the b position.

5x + 2y = 8
2y = -5x + 8
y = -5/2x + 8.....slope (m)  is -5/2

3x - 7y = 10
-7y = -3x + 10
y = 3/7x - 10/7.....y int (b) = -10/7

so ur equation with slope(m) of - 5/2 and y int (b) of -10/7 is :
y = -5/2x - 10/7 <== slope intercept form



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A scientist needs 10 L of a solution that is 60% acid. She has a 50% acid solution and a 90% acid solution she can mix together
sineoko [7]

Answer:

<u>The equations system is:</u>

<u>x + y = 10</u>

<u>0.5x + 0.9y = 6</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Liters of 60% acid solution needed = 10

x = Number of liters of the 50% solution

y = Number of liters of the 90% solution

2. Which equation represents the total liters of acid that are needed?

There are two equations needed:

The first one related to the total liters needed, 10 in this case:

x + y = 10

The second one related to the acid concentration of the 10 liters:

0.5x + 0.9y = 10 * 0.6

0.5x + 0.9y = 6

<u>The equations system is:</u>

<u>x + y = 10</u>

<u>0.5x + 0.9y = 6</u>

Solving for x and y in the 2nd equation, we have:

0.5 (10 - y) + 0.9y = 6

5 - 0.5y + 0.9y = 6

0.4y = 6 - 5

0.4y = 1

y = 1/0.4 = 2.5 ⇒ x = 7.5 (10 - 2.5)

The scientist can mix 7.5 liters of the 50% acid solution and 2.5 liters of the 90% acid solution to get the 10 liters of the 60% acid solution.

6 0
3 years ago
Please help me with this
Elan Coil [88]

Answer:

Step-by-step explanation:

L(d) = 189 - 7d

L(17) = 189 - 7·17 = 70 miles

After 17 days, 70 miles of track remain.

:::::

189 miles × (1 day)/(7 miles) = 27 days

It takes a total of 27 days to lay the track.

8 0
3 years ago
Please help! Add. Simplify the answer and write it as a mixed number. 3 4/5 + 1 4/15
nalin [4]
Answer- 5 11/15
First step- get the same denominator for first fraction
3 4/5 times 3/3

Second step- add the whole number
1+3=4

Third step-
12/15+14/15+4

Fourth step-
4+1 26/15

Answer - 5 11/15
8 0
3 years ago
Read 2 more answers
In triangle △ABC, ∠ABC=90°, BH is an altitude. Find the missing lengths. BC=9 and HC=3, find AH.
Troyanec [42]

Answer:

24

Step-by-step explanation:

you can find the details in the attachment.

6 0
4 years ago
Determine the value of x
irinina [24]
The sum of the interior angles of all triangles is 180 degrees. This means you can set all the angles' expressions equal to 180 and solve algebraically for x.

180 = 3x + 2x + x
180 = 6x
30 = x

Answer:
30°
7 0
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