exam Maths Puzzle Numerical Ability

Solve by addition or subtraction. If a unique solution does not exist, state whether the system is dependent or inconsistent.

3x + 2y = 1
5x + 3y =16

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exam Other Question

4x + 4/2 = 3(x + 1) - 2 Solve by the Addition Method:

3x+y=5
3y-z=2
x+z=5

For some reason, I'm able to do the problems if each equation has all three of the variables, and unable to do the problem