Mathematics, 10.07.2019 12:20 meth77

Solve the system of equations. 3x+2y+4z=7 4x+3y+5z=9 7x+4y+7z=5

Answers: 1

Show answers

Answers

Answer from: jess6142

Solve the following system using elimination: The preceding { should cover all 3 lines, but it doesn't work in this interface. i.e it should be one big bracket covering 3 lines. I omitted them on the next steps and result. see attached Answer for clarification.{3 x + 2 y + 4 z = 7 | (equation 1){4 x + 3 y + 5 z = 9 | (equation 2){7 x + 4 y + 7 z = 5 | (equation 3)
Swap equation 1 with equation 3:{7 x + 4 y + 7 z = 5 | (equation 1)4 x + 3 y + 5 z = 9 | (equation 2)3 x + 2 y + 4 z = 7 | (equation 3)
Subtract 4/7 × (equation 1) from equation 2:{7 x + 4 y + 7 z = 5 | (equation 1)0 x+(5 y)/7 + z = 43/7 | (equation 2)3 x + 2 y + 4 z = 7 | (equation 3)
Multiply equation 2 by 7:{7 x + 4 y + 7 z = 5 | (equation 1)0 x+5 y + 7 z = 43 | (equation 2)3 x + 2 y + 4 z = 7 | (equation 3)
Subtract 3/7 × (equation 1) from equation 3:{7 x + 4 y + 7 z = 5 | (equation 1)0 x+5 y + 7 z = 43 | (equation 2)0 x+(2 y)/7 + z = 34/7 | (equation 3)
Multiply equation 3 by 7:{7 x + 4 y + 7 z = 5 | (equation 1)0 x+5 y + 7 z = 43 | (equation 2)0 x+2 y + 7 z = 34 | (equation 3)
Subtract 2/5 × (equation 2) from equation 3:{7 x + 4 y + 7 z = 5 | (equation 1)0 x+5 y + 7 z = 43 | (equation 2)0 x+0 y+(21 z)/5 = 84/5 | (equation 3)
Multiply equation 3 by 5/21:{7 x + 4 y + 7 z = 5 | (equation 1)0 x+5 y + 7 z = 43 | (equation 2)0 x+0 y+z = 4 | (equation 3)
Subtract 7 × (equation 3) from equation 2:{7 x + 4 y + 7 z = 5 | (equation 1)0 x+5 y+0 z = 15 | (equation 2)0 x+0 y+z = 4 | (equation 3)
Divide equation 2 by 5:{7 x + 4 y + 7 z = 5 | (equation 1)0 x+y+0 z = 3 | (equation 2)0 x+0 y+z = 4 | (equation 3)
Subtract 4 × (equation 2) from equation 1:{7 x + 0 y+7 z = -7 | (equation 1)0 x+y+0 z = 3 | (equation 2)0 x+0 y+z = 4 | (equation 3)
Subtract 7 × (equation 3) from equation 1:{7 x+0 y+0 z = -35 | (equation 1)0 x+y+0 z = 3 | (equation 2)0 x+0 y+z = 4 | (equation 3)
Divide equation 1 by 7:{x+0 y+0 z = -5 | (equation 1)0 x+y+0 z = 3 | (equation 2)0 x+0 y+z = 4 | (equation 3)
Collect results: {x = -5
y = 3
z = 4

Solve the system of equations. 3x+2y+4z=7 4x+3y+5z=9 7x+4y+7z=5

Solve the system of equations. 3x+2y+4z=7 4x+3y+5z=9 7x+4y+7z=5

Answer from: Quest

2/3

step-by-step explanation:

Answer from: Quest

step-by-step explanation:

i found the life tables for the year 2012.

life table of males at age 30. probability of dying between ages x and x+1

total population:

29–30 . . . . . . . . . . . . 0.001030

30–31 . . . . . . . . . . . . 0.001061

males:

29–30 . . . . . . . . . . . . 0.001420

30–31 . . . . . . . . . . . . 0.001448

white population

29–30 . . . . . . . . . . . . 0.001005

30–31 . . . . . . . . . . . . 0.001037

white males

29–30 . . . . . . . . . . . . 0.001372

30–31 . . . . . . . . . . . . 0.001399

non hispanic white population

29–30 . . . . . . . . . . . . 0.001083

30–31 . . . . . . . . . . . . 0.001116

non hispanic white males

29–30 . . . . . . . . . . . . 0.001477

30–31 . . . . . . . . . . . . 0.001503

jacob, non hispanic white male. 30 years old.

probability that jacob lives to be 30 years old.

since the given probabilities are probabilities of dying, i think we simply subtract it from 1 to get the probability of living. we will use the probability of non hispanic white male.

probability of living to be 30 y.o.

29 - 30 : 1 - 0.001477 = 0.998523

30 - 31 : 1 - 0.001503 = 0.998497

Another question on Mathematics

Mathematics, 21.06.2019 16:50

An angle that measures between 90 and 180° is called a(,

Answers: 2

Answer

Mathematics, 21.06.2019 17:50

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Answers: 1

Answer

Mathematics, 21.06.2019 18:00

Find the multiplicative inverse of 8-12i

Answers: 2

Answer

Mathematics, 21.06.2019 18:50

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Answers: 1

Answer

You know the right answer?

Solve the system of equations. 3x+2y+4z=7 4x+3y+5z=9 7x+4y+7z=5...

Questions

Mathematics, 01.03.2021 21:30

There are four different kinds of animals on the farm. There is a different number of each animal. There are 19 more cows than sheep . There are 19 mo...