exam Maths Puzzle Numerical Ability

Use Gaussian elimination with backward substitution to solve the system of linear equations. Write the solution as an ordered pair or ordered triple, whenever possible.
x+2y+z=3
x+y-z=3
-x-2y+z=-5

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exam Other Question

Express10/3-5/2 as a simplified rational number. The slope of the line that passes through the points(-2,4) and (-3,7) is_?
a. negative b. postive c.undefined d.zero