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Damm [24]
3 years ago
15

Please help asap....​

Mathematics
2 answers:
quester [9]3 years ago
8 0

Answer: B or D

Step-by-step explanation:

mariarad [96]3 years ago
7 0
I think it might be D-
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Please help fr , like i acc need help
xeze [42]

Step-by-step explanation:

first a little help, how they got the equations :

in total they need 15 liters.

so, whatever x and y are, but together they must be 15 L.

x + y = 15

then, we are mixing x liters of 20% alcohol with y liters of 100% alcohol, that have to result in a 40% solution of (x+y) liters :

0.2x + y = 0.4(x+y)

we know from the first equation that x+y = 15, so the second equation is actually

0.2x + y = 0.4 × 15 = 6

so, we have

x + y = 15

0.2x + y = 6

do you notice something ? there is a "+ y" in both equations.

so we can actually subtract the second equation from the first, eliminate y and solve for the remaining x. and then use one of the original equating to get also y :

x + y = 15

- 0.2x + y = 6

---------------------

0.8x 0 = 9

0.8x = 9

x = 9/0.8 = 11.25 liters

x + y = 15

11.25 + y = 15

y = 15 - 11.25 = 3.75 liters

8 0
2 years ago
What is x+3y=-11 -9y=33+3x in college algebra
slavikrds [6]
<span>x + 3y= -11 (1)
</span><span>-9y = 33 + 3x  ---->3x + 9y = -33 (2)

divide (2) equation by 2
</span>3x + 9y = -33
  x + 3y = -11 (2')
and equation (1) is also x + 3y= -11 (1)
so
x + 3y= -11 (1)
x + 3y= -11 (2')
---------------------subtract
0 = 0

answer:
infinitely many solutions
<span>

</span>
8 0
4 years ago
What is the m=<br> And what is the equation<br> Please help me asap its almost due
Alenkasestr [34]

Answer:

m = 1\frac{1}{7}, y = 1\frac{1}{7}x + 10

Step-by-step explanation:

The equation of a line is y = mx + c where m is the slope and c is the y-intercept. I will be calculating the slope using the points (7, 2) and (0, 10)

m = \frac{rise}{run}

   = \frac{2-10}{7-0}

   = \frac{8}{7}

   = 1\frac{1}{7}

Based on the graph, the y-intercept is 10. Thus, the equation of the line is 1\frac{1}{7}x + 10.

7 0
3 years ago
Read 2 more answers
What is the inverse function of y= -2/3x+4
love history [14]
find\ "x"\\\\y=-\frac{2}{3}x+4\ \ \ \ |subtract\ 4\ from\ both\ sides\\\\y-4=-\frac{2}{3}x\ \ \ \ |multiply\ both\ sides\ by\ 3\\\\3y-12=-2x\to-2x=3y-12\ \ \ |divide\ both\ sides\ by\ (-2)\\\\x=\frac{3y}{-2}-\frac{12}{-2}\\\\x=-\frac{3}{2}y+6\\\\Your\ answer:\boxed{y=-\frac{3}{2}x+6}
6 0
3 years ago
What is the value of b?
Gnoma [55]

Answer:

the B value is The Middle number, which is the number next to and multiplied by the x

3 0
3 years ago
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