All categories

3 years ago

Which of these shows the result of using the first equation to substitute for y in the second equation then combing like terms

Mathematics

1 answer:

AnnyKZ [126]3 years ago

8 0

$2x + 3y = 55$

$2x + 3(3x) = 55$

$2x + 9x = 55$

$11x = 55$

$\frac{11x}{11} = \frac{55}{11}$

x=5

You might be interested in

Write a polynomial function of minimum degree with real coefficients whose zeros include those listed. Write the polynomial in s

chubhunter [2.5K]

This is a polynomial of degree 4, because you have 4 roots real or imaginary:1st) x= 5 →(x-5)=0
2nd) x = - 3→(x+3) =0
3rd) x = -1+3i →(x+1-3i) = 0
and the 4th one that is not mentioned which is the conjugate of
-1+3i, that is -1-3i (in any polynomial if a root has the form of a+bi, there is always a conjugate root = a-bi)

4th) x= -1-3i→(x+1+3i) = 0
Hence the polynomial =(x-5)(x+3)((x+1-3i)(x+1+3i)
Solving the above will give you (unless I am mistaken, pls recalculate):

x⁴-9x²-50x-150<u />

6 0

3 years ago

Read 2 more answers

Answer each part. If necessary, round your answers to the nearest hundredth.

Aneli [31]

Answer:

2.8 pages in one minute ( 3 pages if rounded)

Step-by-step explanation:

14 pages in five minutes

therefore one minute=

14÷5=2.8 pages /3

7 0

2 years ago

Estimate the sun by round each number to the nearest whole number?<br><br> 1.78+4.25

Tomtit [17]

6
I would round:
1.78 to 2
4.25 to 4
So: 4+2=6

5 0

3 years ago

Read 2 more answers

Suppose that x and y vary inversely, and x = 7 and y=11. Which function models the inverse variation?Answers:Y=1.57xY=77/xY=4/xY

sdas [7]

Answer:

Y=77/x

Explanation:

Y varies inversely with x meaning

$y\propto\frac{1}{x}$

adding a proportionality constant gives

$y\propto\frac{k}{x}$

Now, we are told that y = 11 and x = 7; therefore, the above gives

$11=\frac{k}{7}$

Solving for k gives

$k=77$

Therefore, the function that models the inverse variation is

$y=\frac{77}{x}$

which is our answer!

5 0

10 months ago

Which graph represents viable values for y = 5.5x, where x is the number of cans of tomato paste and y is the total weight of th

Brilliant_brown [7]

Answer:

On a coordinate plane, x-axis is numbered negative 5 to positive 5 in increments of 1, and the y-axis is numbered negative 27.5 to 27.5 in increments of 5.5. Solid circles appear at points (0, 0), (1, 5.5), (2, 11), (3, 16.5), (4, 22), (5, 27.5)

Step-by-step explanation:

The first graph is not correct because you cannot sell or buy, for example 1.1, cans of tomato.

The second graph is correct because x is discrete variable, that is, it only take values like 1, 2, 3, etc.

The third and fourth graphs are not correct because you cannot sell or buy negative cans of tomatoes.

6 0

3 years ago

Read 2 more answers