Use matrices to solve this linear system: 5x1 − 2x2 = −30 2x1 − x2 = −13 x1 = x2 =

and

Step-by-step explanation:

Consider  given system ,  

We have to solve for and

In matrix form,

then this is in form of AX = b,

A=

X=

b=

Pre-multiply by both side, we get,

  ..............(1)

First finding inverse of A ,

Thus, inverse of A is ,

Now substitute in (1) , we get,

Multiply , we get,

Thus,   and

0.0076, if you meant 4.125 divided by 0.03125 it would be 132

step-by-step explanation:

first you have to move the decimal in 0.03125 over until its behind the 5 which is 5 places over. now the number is 3125

then you have to move the decimal in 4.125, 5 places over. now the number is 4,112,500.

now you divide like you would normally would and get 0.0076