exam Maths Puzzle Numerical Ability

solve each of the following linear equation for variable x, y, and z. you may use any method.

-2x+ 4y - 2z = -14
2x - 5y -4z = -9
2x -1y +3z = 15

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exam Other Question

Graph in the rectangle coordinate systems provided

x - 2y = 6
|3x+2|less than or equal to 4
I under stand these brackets on the expression mean absolute value but what is the absolute value of 3x+2