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Phantasy [73]
3 years ago
9

Use substitution method 3x +4y+175x-2y=11​

Mathematics
1 answer:
Viefleur [7K]3 years ago
4 0

3x +4y+175x-2y=11

4y-2y+175x+3x=11

2y+178x=11

2y=11-178x

y=\frac{11-178x}{2}

y=-89x+\frac{11}{2}

178x=-2y+11

x=\frac{-2y+11}{178}

x=\frac{-1}{89} y+\frac{11}{178}

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the temperature is -5C which is negative so its behind the zero on a number line  and 6C is positive which is infront of the zero so it would be 1C by noon

Step-by-step explanation:

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2 years ago
What is the median of 3 3 4 5 5 5 6 6 6 7 8​
Zigmanuir [339]

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5

Step-by-step explanation:

The median is the middle number of the list when put in order from smallest to largest

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7 0
3 years ago
Read 2 more answers
10x+4y+ 12z=120 <br> 11x +77y =220 <br> 8x +2y +32z =160
Damm [24]

Answer:

x=8.94 ; y = 1.58; z=2.02

Step-by-step explanation:

solve 10x+4y+12z = 120      →          5x+2y+6z = 60

         8x + 2y +32Z = 160   →           4x+y+16z = 80

To eliminate z multiply first equation by 16 and second equation by 6.

80x+32y+96z = 960

24x+6y+96z =   480

on subtractionwe get 56x+26y = 480

dividing by 2 we get, 28x + 13y = 240

Now we have a given equation 11x + 77y = 220 → x + 7y = 20

solving 28x + 13y = 240 and x + 7y = 20

28x + 13y =240

28x + 216y = 560

subtracting we get, 203y = 320

y = 1.58

x = 8.94

z = 2.02

6 0
3 years ago
At Elisa's Printing Company LLC there are two kinds of printing press: Model A which can print 70 books per day and Model B whic
NeX [460]

Answer:

Number of Model A press = 9 and Number of Model B press = 5

Step-by-step explanation:

Number of books Model A can print per day = 70

Number of books Model B can print per day = 55

Let x be the number of Model A press and y be that of Model B press.

Total number of printing presses = 14

x + y = 14  ----------------1

Total number of books printed per day = 905

70x + 55y = 905-------2

Putting y = 14 - x in equation 2, we get:

70x + 55(14 - x) = 905

15x = 135

x = 9

y = 14 - 9 = 5

Hence number of Model A press is 9 and that of Model B press is 5.

8 0
3 years ago
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