exam Maths Puzzle Numerical Ability

Use elementary row operations to write the matrix in echelon form:
[2 4 2 6]
-2 1 3 4
3 2 1 5

please someone help me figure this out and if anyone could tell me how to writ

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exam Other Question

Solve, and express you answer in exact form: log(x) + ln(x) = 1 Make a conjecture about the relationship between the original number and the final number in the following process.
Pick a number
Multiply the number by 12
Add 12 to the product
Divide the sum by 4
Subtract 3 from the quotient