exam Maths Puzzle Numerical Ability

(1, -4, 3) is the solution to the system, true or false?
x+y+z=0
x-y+5z=20
5x+y+z=4

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exam Other Question

FIND THE LCM (5+2P), (25-4P 2SQUARED), AND (5-2P)

I AM HAVING TROUBLE FINDING THE LCM FOR THIS QUESTION. CAN YOU PLEASE WALK ME THROUGH THE STEPS TO SOLVE.

THANKS,

JESSICA B. solve the system by addition

2x - 4y = 7
4x + 2y = -1