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Murljashka [212]
3 years ago
15

If 3x + 5y = 42 and 9x +7y = 78, then x + y = ?

Mathematics
1 answer:
kumpel [21]3 years ago
8 0
3x+5y=42

9x+7y=78

adding above equation

12x+12y=120

x+y=10
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Mrs.torres class has 28 students. The class includes 12 boys. What is the ratio of girls to boys?
raketka [301]

Answer:

16:12

Step-by-step explanation:

if there is 12 boys, that leaves the other 16 to be girls

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3 years ago
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Alex17521 [72]
Hmm, (x,y)
x is horizontal or left right
y is vertical or up down


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6 0
3 years ago
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3. Four chicken nuggets have 180 calories. How many calories are in 9 chicken
Lemur [1.5K]

Hey there! :)

Answer:

405 calories.

Step-by-step explanation:

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\frac{180cal}{4}= \frac{xcal}{9}

Cross multiply:

9 · 180 = 4 · x

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8 0
2 years ago
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Y= 2/3x what is the slope
adoni [48]

Answer:

the slope is −3 .

6 0
2 years ago
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Dafna1 [17]
The answer is:
X int- 4
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Explanation:
You must subtract 12 from both sides
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Y=4x-12

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6 0
2 years ago
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