exam Maths Puzzle Numerical Ability

Solve the following system by graphing.

3x - 6y = 9
x - 2y = 3

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exam Other Question

How do you solve and graph:
/c-4/ > 1

The c-4 is in absolute value lines.

Thank you! Will you help me with substitution?

y=4x
3x-y=1

and

-3x+5y=81
2x+y=24