exam Maths Puzzle Numerical Ability

1.solve by graphing
5x-y=3
y=5x-3
2. solve by back substtution
2 4 1 :1
1 -2 -3 :2
1 1 -1 :-1

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exam Other Question

find the coordinates of the midpoint of a segment with the given endpoints:
A (0,0), B (-8,6)
Please help me!!!
How do I simplify this equation.
-12-|7-11|-[3-(-9)]
PLEASE HELP!!!