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3 years ago

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Please help!! find h(8)-f(-7)

1 answer:

kari74 [83]3 years ago

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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

4 years ago

Someone help please

nadezda [96]

Answer:

26

Step-by-step explanation:

because look at the tail

7 0

3 years ago

To finish a certain job in 8 days, 6 workers are needed. If it is required to finish the same job in 2 days advance, how many wo

kotykmax [81]

Answer: 96 workers

Step-by-step explanation:

First you multiply 8 and 6 then by 2.

8 x 6= 48

48 x 2= 96

96 workers to help the business

4 0

3 years ago

Which of the following is equivalent to “the product of 2 and 3 is increased by 7”?

trasher [3.6K]

A. 2(3)+7

product is multiplication
increased is addition

8 0

3 years ago

The Cooking Club made some pies to sell during lunch to raise money for an end-of-year banquet. The cafeteria contributed three

Alex73 [517]

7x13=91 meaning 13 pies were made in total. Since the cafeteria contributed 3 we can subtract 3 from 13. Ultimately meaning that the club contributed 10 pies.

The answer is 10.

3 0

4 years ago