exam Maths Puzzle Numerical Ability

how do you solve for example: y=3x
x+y=12

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Write the equation of the line with given slope and y intercept. Then graph each line using the slope and y intercept. McGraw Hill 6th edition. 7.1 problem # 18. Thanks so very much for your help!!

Slope: 5;y-intercept: (0,-2) a bag contains 16 red checkers and 16 black cherkers. anne removes 1 black checher and 2 red checkers from the bag and does not replace them. she the reaches into the bag and selects a checker at random. what is the probability that the checker is red?