Question

What is the solution of the system? Use substitution.

x = –2y + 10
–6y = 6x – 6
z = –3x + 10y
A. x = 9, y = –8, z = 114
B. x = –8, y = 9, z = 114
C. x = –8, y = 114, z = 9
D. x = 114, y = 9, z = –8

Answer 1

i know it is not (C)

Answer 2

If it's multiple choice, it would be just as much or less work to just try all the possible solutions.

Answer 3

Otherwise, a good first step is to reduce the second equation by dividing it by -6.

Answer 4

i am thinking it is (A)

Answer 5

From there, since the first two equations have the same two unknowns, you can solve that system first for x and y, and then sub. into eq.3 for z.

Answer 6

after dividing by -6
add 1st 2 equations,u will get x and y

Answer 7

so it is not (A)

Answer 8

no, not A

Answer 9

=(

Answer 10

I like substitution for this one. Just using the top two eqn's you can get x and y wich leads to the answer.

Answer 11

first divide the 2 eqn by 6 and note the value of -y. Then multiply the the value of -y with 2.Substitute this value to eqn 1 and you will get the value of x i.e -8. now solve for y by using any eqn. the value of y=9. nNow substituting the value of both x and y in third eqn we get 114. So the answer to the ques is B

Answer 12

thank you