Question

could some one by chance help me with this like step by step so that im not all confused about the other questions because im totally confused on this question :P

1. what is the solution of the system? solve using matrices
{x+2y=9
{x+y=1

Answer 1

it's easy make a matrix (2x2) by using only coefficents of x and y that will and this will be matrix A now may another matrix (2x1) by using x and y elements in it only this is matrix X now = and anohter 2x1 matrix containing 9 and 1 this is matrix B the equation will take form A multiply X =B now we want x and y so take A to other side it will become X=A inverse B now take A inverse and multiply it with B a (2x1) matrix will be attained now x=first row and Y=second row

Answer 2

O.o okay wait so the first equation is A and the second one is B ?

Answer 3

no first matrix is A and second matrix X the product of both these = B

Answer 4

I am still very confused O.o

Answer 5

yup i can't simplify it without showing matrices but i can't here do I? so this is all i have sorry

Answer 6

do you know how to get inverse of a 2X2 matrix ?

Answer 7

some what not really could you explain it on how to do it cause im very confused

Answer 8

ok, lets first make a co-efficient matrix A
the co-efficients of x and y are
1,2 and 1,1 right ???

so our first matrix A goes like this

Any doubts on how to form A ?

Answer 9

inverse of a