If of a number is 56, what was the original number

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,

3 3 6, because in every triangle the longer side is always shorter than the sum of the other two