kuddlebugsmommy
15.03.2020 •
Mathematics
How do you solve
2x+y=6
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Ответ:
Step-by-step explanation:
Are you solving for both or just x or just y
Ответ:
Y=-2x+6
Step-by-step explanation
For this question, since the X is a positive you would subtract it and move it to the other side which makes it a negative
Ответ:
$5
Step-by-step explanation:
We can solve this using a system of linear equations. The equations are written like this:
3v + 9d = 75
5v + 10d = 100 (25 more than Dawn's total is 100)
V represents video games and d represents DVDs.
Let's isolate a variable, I'm going to isolate v in the first equation:
3v = -9d + 75
v = -3d + 25
Now that we isolated v we can plug it in to the second equation:
5(-3d + 25) + 10d = 100
-15d + 125 + 10d = 100
-5d + 125 = 100
-5d = -25
d = 5
Therefore, each DVD cost $5.
Check:
3v + 9(5) = 75
3v + 45 = 75
3v = 30
v = 10
5(10) + 10(5) = 100
50 + 50 = 100
100 = 100
I hope this helps!!
- Kay :)