book Maths Puzzle Numerical Ability

im really having a hard time with this...any help would be appreciated.

Find an equation for the line that passes through (1,-4) and has slope -3/4

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Hours Worked Hours Remaining
1.5h 6.5 h
3 h 5 h
4.5 h 3.5 h
what is the eqaution? Instructions: For questions 30 and 31 use quadrilateral DEFG inscribed in the circle. If m < GFE = 2x, m < FGD = 2x-12 and m < EDG = 2x + 20 find each measure.
Problems: 1. m < GF