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2 years ago

Solve the system by substitution.

Mathematics

2 answers:

mezya [45]2 years ago

8 0

Answer:

(2, 6)

Step-by-step explanation:

if you meant for both of the y to be the same then this should be right

Roman55 [17]2 years ago

8 0

Answer:

(2,6)

Step-by-step explanation:

*this is actually elimination*

1st- Turn both of them into standard form.

y=9x-12 ---> 9x-y=12

y=3x --> 3x-y=0

Multiply 9x-y=12 by -1

-9x+y=-12

3x-y=0

-6x=-12

divide by 6

x=2

Plug 2 into the first equation

9(2)-y=12

18-y=12

Cancel out 18 by subtracting -18 to both sides

-y=-6

divide by -1

y= 6

Answer: (2,6)

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If A=3x^2+5x-6 and B= -2x^2-6x=7, then A-B equals

Kryger [21]

Yup ur right les goo

6 0

2 years ago

Alan needs to read 4 novels each month Let N be the number of novels Alan needs to read in M months. Write an equation relating

MaRussiya [10]

Answer:

T=N*M and he needs to read 44 books.

Step-by-step explanation:

Note: Let T represent the total amount of books that Alan needs to read in 11 months.

If we plug in the information we have been given we will find the total:

T=N*M

T=4*11

T=44

Alan has to read 44 books within a 11 month period.

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6 0

3 years ago

The number of bacteria in a refrigerated food product is given by N ( T ) = 22 T 2 − 123 T + 40 , 6 < T < 36 , where T is

antoniya [11.8K]

Answer:

$N(T(t)) = 1408t^2 - 385.6t - 105.52$

Time for bacteria count reaching 8019: t = 2.543 hours

Step-by-step explanation:

To find the composite function N(T(t)), we just need to use the value of T(t) for each T in the function N(T). So we have that:

$N(T(t)) = 22 * (8t + 1.7)^2 - 123 * (8t + 1.7) + 40$

$N(T(t)) = 22 * (64t^2 + 27.2t + 2.89) - 984t - 209.1 + 40$

$N(T(t)) = 1408t^2 + 598.4t + 63.58 - 984t - 169.1$

$N(T(t)) = 1408t^2 - 385.6t - 105.52$

Now, to find the time when the bacteria count reaches 8019, we just need to use N(T(t)) = 8019 and then find the value of t:

$8019 = 1408t^2 - 385.6t - 105.52$

$1408t^2 - 385.6t - 8124.52 = 0$

Solving this quadratic equation, we have that t = 2.543 hours, so that is the time needed to the bacteria count reaching 8019.

4 0

3 years ago

HELPPPPPP!! ASAPPP!!! PLEASE!! WILL GIVE EXTRA POINTS! 4.8 4 8 7.2

vivado [14]

Answer:

x = 4

Step-by-step explanation:

180° - 114° = 66°

15x - 6 = 66

15(4) - 6 = 66

60 - 6 = 54

Statement is wrong because we can see another angle. so...

Final answers: x = 4 while 54 + 114° = 168° then 180° - 168° = 12°

6 0

3 years ago

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Lubov Fominskaja [6]

Yes um can you translate that?

7 0

2 years ago