book Maths Puzzle Numerical Ability

Im new and having trouble on this problem: Find the slope and y-intercept for each line that has a slope and Y-intercept. x+y=5

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my question is:
solve 6m-5n=-14 for m
thanks
Te gym is 21 years newer than the auditorium. The gym is also one fourth as old as the auditorium. How old is each building Choices for the auditorium's age: 26, 27, 28.