exam Maths Puzzle Numerical Ability

h=18t+1/2at^2

Solving for A

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exam Other Question

I need helping to solve using row operations on each system:
x+yz-3z=1
2x-y+z=9
3x+y-4z=8 Find 4 solutions for each equation, write the solution as ordered pairs, then graph them.
y=x-1
and
x+y=5