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Ymorist [56]
3 years ago
9

What is the sum of (2x - 4y) and (9x + 2y)? Please explain

Mathematics
1 answer:
navik [9.2K]3 years ago
7 0

Answer:

11x-2y

Step-by-step explanation:

Combine like terms so 2x+9x=11x AND -4y+2y=-2y so answer follows as 11x-2y

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System of Equations <br> Need help<br> Trig
Yanka [14]

Looks like the system is

\begin{cases}-2x+y+6z=1\\3x+2y+5z=16\\7x+3y-4z=11\end{cases}

We can eliminate y by taking

(3x+2y+5z)-2(-2x+y+6z)=16-2(1)

\implies3x+2y+5z+4x-2y-12z=16-2

\implies7x-7z=14

\implies x-z=2

so that z=x-2, and

(7x+3y-4z)-3(-2x+y+6z)=11-3(1)

\implies7x+3y-4z+6x-3y-18z=11-3

\implies13x-22z=8

Substitute z=x-2 into this last equation and solve for x:

13x-22(x-2)=8

\implies13x-22x+44=8

\implies-9x=-36

\implies x=4

Then

z=x-2

\implies z=4-2

\implies z=2

Plug these values into any one of the original equation to solve for y:

-2x+y+6z=1

\implies-2(4)+y+6(2)=1

\implies-8+y+12=1

\implies y=-3

Hence the solution is x = 4, y = -3, and z = 2.

6 0
3 years ago
17 + (9 + 10) = (17 + 9) + 10<br> A. True<br> O B. False
JulijaS [17]

Answer: Did you mean to rewrite that

Step-by-step explanation:

3 0
2 years ago
Read 2 more answers
What is the equation in point slope form of a line that passes through the point (−8, 2) and has a slope of 12 ? Drag a number,
NemiM [27]
Point-slope form:

y − b = m(x − a<span>), where m is the slope and (a, b) is a point on the graph.

Here that would look like:

y - 2 = 12(x - (-8))
y - 2 = 12(x + 8)

The answer:
</span>y - 2 = 12(x + 8)

Hope this helps.
5 0
3 years ago
Sally walked 3/4 of a mile before lunch and 1/2 of a mile after lunch. How far did she walk in all?
Wittaler [7]

Answer:

1 1/4

Step-by-step explanation:

5 0
2 years ago
A newborn baby weighs 2900 grams. How many pounds does this baby weigh? Also how many pounds, how many ounces
Anestetic [448]

Answer:

6.39 pounds, 102.29 ounces.

Step-by-step explanation:

6 0
2 years ago
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