exam Maths Puzzle Numerical Ability

use row operations to solve the system
x+y-z=1
3x-y+z=1
x-4y=+2z=-22

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exam Other Question

A line passing through (�6, �5) and (�1, y) is perpendicular to a line with slope -5/13 . Find the value of y Please solve and graph the inequality. thanks!

-3 < 2x - 1 < 9