1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
White raven [17]
3 years ago
6

X+Y-Z=19 2X-3Y+Z=13 3X-5Y-6Z=-15

Mathematics
1 answer:
lawyer [7]3 years ago
7 0

A suitable graphing caculator gives the result

X = 15 25/39

Y = 7 6/13

Z = 4 4/39

_____

If you want to solve this by hand, you can add 3 times the first equation to the second to get

... 5X -2Z = 70

and 5 times the first equation to the third to get

... 8X -11Z = 80

Then Cramer's Rule tells you the solutions for X and Z are

... X = (-160+770)/(-16+55) = 610/39

... Z = (560 -400)/39 = 160/39

From there, you can substitute into any of the equations to find Y. The first one might be most convenient.

... Y = 19 -X +Z = 19 -(15 25/39) +(4 4/39) = 8 -21/39 = 7 6/13

You might be interested in
What is the perimeter of the square 3 by 3
Tema [17]

Answer:12cm

Step-by-step explanation:3+3+3+3 because its 3x3 so their is 3cm on each side

5 0
3 years ago
Trey is 3 times older than his sister Kellit k stands for Kelli's age, which expression represents Trey's age?
ddd [48]
3 hope that can help you
4 0
3 years ago
for v= 4i - 5j, find unit vector u in the direction of v, and write your answer as a linear combination of the standard unit vec
umka21 [38]

Answer:

a. u=\frac{4\sqrt{41}i }{41}-\frac{5\sqrt{41}j}{41}

Step-by-step explanation:

The given vector is v= 4i - 5j

The magnitude of this vector is;

|v|=\sqrt{(-4)^2+(-5)^2}

|v|=\sqrt{16+25}

|v|=\sqrt{41}

The unit vector u in the direction of v is;

u=\frac{v}{|v|}

u=\frac{4i - 5j}{\sqrt{41}}

u=\frac{4i }{\sqrt{41}}-\frac{5j}{\sqrt{41}}

We rationalize to get

u=\frac{4\sqrt{41}i }{41}-\frac{5\sqrt{41}j}{41}

4 0
3 years ago
Read 2 more answers
Marcie cooked dinner for herself. The original recipe has a serving size of 4 and requires four and four fifths pounds of chicke
Margarita [4]

Answer:

1.2 pounds of chicken per serving.

Step-by-step explanation:

4 and 4/5 of pounds of chicken for serving of 4.

We can also write this as 4.8 pounds of chicken.

To find how much pound of chicken will be needed for a single serving we have to divide 4.8 by 4.

\frac{4.8}{4}  = 1.2 \: pounds \: of \: chicken

If this answer helped you, give this answer a heart and rate it.

Thanks!

7 0
2 years ago
I need help with this .....
insens350 [35]

Answer:

6.5 hours

Step-by-step explanation:

hope this helped u bye

4 0
3 years ago
Other questions:
  • 1. Nuri wants to determine the average distance she travels each day in her car. She records the odometer reading each morning f
    7·1 answer
  • Jake is comparing the prices of two laundry service companies. Company A charges $20 per load and an additional $8 as service ch
    12·2 answers
  • P/2 is less than or equal to negative 3
    8·2 answers
  • You can work no more than 60 hours each week at your two jobs. Dog walking pays $7 per hour and your sales job at Computers &amp
    5·2 answers
  • You are making several purchases from the B-Better Electronics store. You can buy from this store online or in a physical store.
    8·2 answers
  • I need help preciate it
    13·1 answer
  • Solve 13+x>11. Enter your answer as an equality
    5·1 answer
  • Find the value of x in the figure
    8·2 answers
  • I am in need of help please.​
    7·1 answer
  • PLEASE HELP ME I DONT UNDERSTAND
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!