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 an

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exam Other Question

- 6 < or equal to 3 + x < 4

3x + 1 < or equal to -2 or 2x + 3 > or equal to 5

[x - 4] > 3
Please help to Draw and Label :

Line L and M in plane ABC intersect at point C