Did I get these right?

probability for j is 1/4

while

a is 1/6

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,