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Hunter-Best [27]
3 years ago
6

How do you do this solved by substitution?

Mathematics
1 answer:
ladessa [460]3 years ago
3 0
X=-12-3y
2(-12-3y) - y = -3
-24 - 6y - y = -3
-7y = 21
y = -3

x = -12 - 3(-3)
x = -3
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If 4 hens lay 7 eggs in three days, how many eggs will 12 eggs lay in 9 days?
garik1379 [7]

Answer:

how many eggs will 12 eggs lay ???

Step-by-step explanation:

5 0
3 years ago
What do u mean by lcm​
algol13
Least common multiple
8 0
2 years ago
50 points and BRAINLIEST!
Harman [31]

Answer:

Step-by-step explanation:

The general equation of a circle is , x² + y² + 2gx + 2fy + c = 0

Substituting the three points we get the following equations,

2g +14f +c=-50

14g - 2f + c =-50

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4 0
3 years ago
Which operation results in a binomial? (3y ^ 6 + 4) (9y ^ 12 - 12y ^ 6 + 16)
AleksAgata [21]

Step-by-step explanation:

Given the expression, (3y ^ 6 + 4)  (9y ^ {12} - 12y ^ 6 + 16), we want to know which sign placed in between the two polynomial will produce a binomial.

Using a plus (+) sign to check:

= (3y ^ 6 + 4) + (9y ^ {12} - 12y ^ 6 + 16)\\=  (3y ^ 6 + 4) + (9y ^ {12} - 12y ^ 6 + 16)\\collect \ like \ terms\\= 9y^{12} +3y^6 - 12y^6 + 16+ 4\\= 9y^{12} - 9y^6 + 20\\

From the gotten value, it can be seen that the resulting answer produces 3 terms, showing that it results in a trinomial instead of binomial.

Using a plus (-) sign to check:

= (3y ^ 6 + 4) - (9y ^ {12} - 12y ^ 6 + 16)\\=  3y ^ 6 + 4 - 9y ^ {12} + 12y ^ 6 - 16\\collect \ like \ terms\\= -9y^{12} +3y^6 +12y^6 + 4-16\\= -9y^{12} +15y^6 -12\\

From the gotten value, it can be seen that the resulting answer produces 3 terms, showing that it results in a trinomial instead of binomial.

<em>Hence none of the operations given results in a binomial</em>

3 0
2 years ago
Solve the problem. When going more than 38 miles per hour, the gas mileage of a certain car fits the model where x is the speed
Lubov Fominskaja [6]

Answer:

73 mph

Step-by-step explanation:

The question seems to be incomplete because the model is missing, I found a similar question with the addition of the model, so if we can solve it (see attached image).

We have that the model would be:

y = 43.81 - 0.395 * x

We need to solve for x, if y = 15

Replacing:

15 = 43.81 - 0.395 * x

Solving for x we have:

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The car will average 15 miles per gallon at the speed of 73 miles per hour.

8 0
3 years ago
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