exam Maths Puzzle Numerical Ability

2xsq-3x+1=0

xsq+8x=-16

3xsq=2x+5

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exam Other Question

x + y = 8384

x + z = 8221

What does x,y, and z equal? Could I please have some help on a systems of equations problem? This one needs to be solved by the Graphing method.

3x + y = -6
x + y = -4

Thank you in advance for all your time,and help. Elle J