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OLga [1]
3 years ago
8

Which choice is the most efficient first step to solve this set of equations? y=3x-5 and 2x+6y=20

Mathematics
2 answers:
lesya [120]3 years ago
4 0

Answer:

We substitute the value of y in equation (1) into (2)

Step-by-step explanation:

y=3x-5.........(1)

2x+6y=20........(2)

stepan [7]3 years ago
3 0
Plug in 3x-5 to the second equation for every y value. (This is substitution)
2x +6(3x-5)=20
2x+18x-30=20
20x=50
x=2.5

Then solve the first equation with your x value

y=3(2.5)-5
y=7.5-5
Y=2.5

To check plug the numbers into both
EQ 1: 2.5=7.5-5
EQ 2: 5+15=20

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Solve the equation.<br><br> 5d = 17.1<br><br><br> 12.1<br><br> 22.1<br><br> 85.5<br><br> 3.42
Rudiy27

Hello there!


5d = 17.1

The equation is asking you to find the value for "d". How to do that? Well, all you have to do is divide both side by 5.

5d/5 = 17.1

d = 3.42  

That's your answer!


You can even double check your work, if you want to. How? Well, you just need to replace 3.42 where it belongs.

5(3.42) = 17.1

17.1 = 17.1

True!


Let me know if you have additional questions. As always, it is my pleasure to help students like you!

7 0
3 years ago
Read 2 more answers
Not sure need help ​
Greeley [361]
29/90 use the hint:)
6 0
3 years ago
A vehicle travels on a highway at a rate of 65 mi/h how long does it take the vehical to travel 25 mi?
katrin [286]
Use the velocity formula and solve for time.v=d/t
t=d/v

Substitute your variables and solve.
65 mi/hr = 65 / 3600 mi/second
25 mi / ( 65/3600) = 1384.6 seconds
4 0
3 years ago
Please help me with this question
dmitriy555 [2]

if any doubt leave a comment

3 0
2 years ago
The following graph shows the relationship between cost and revenue for a manufacturer of lab coats.
nataly862011 [7]

Answer:

Option a.

I and III

Step-by-step explanation:

Observing the graph

For n=400 coats

The cost is about $2,200

and

The revenue is less than $1,400

Substitute the value of n=400 in each equation to find the solution

I Cost 1.5(400)+1,600=$2,200 ----> is ok

II Cost 4.5(400)+1,600=$3,400 ----> is not ok ( is greater than $2,200)

III Revenue 3.25(400)=$1,300 ----> is ok ( is less than $1,400)

IV Revenue 5.75(400)=$2,300 ----> is not ok ( is greater than $1,400)

therefore

The solution is I and III

6 0
3 years ago
Read 2 more answers
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