exam Maths Puzzle Numerical Ability

angle BFA and angle DFE are vertical angles. If angle BFA=3r+12 and the measure of angle DFE=-8r+210, what is the measure of angle AFE?

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I need help quick. I need to see these two problems worked out in both the SUBSTITUTION and the ELIMINATION methods.
2x-3y=-1, 3x-4y=5 then 2x+3y=5, 9y=15-6x HELP please help with factoring the following: d+2/6 - d-4/15=