exam Maths Puzzle Numerical Ability

What are the steps to solving a system using substitution. example:

y=x+2 y=2x-1.

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exam Other Question

Re: Absolute Value Inequalities
Solve -

5|x-3|>10 I sent this one before but I forgot the plus 1. I am such a moron. Please help.
Write the equation of the line L satisfying the given geometric conditions.
L has y-intercept (0, -3) and is parallel to the line with equation y=2/3x+1.