exam Maths Puzzle Numerical Ability

Find the slope of any line parrallel to the line through points (15,1)
and (4,2)

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I need a little help with the following problems:

2x + 3y = 8
2x - y = -8


3x - 2y = -5
3y - 4x = 8


3x - y = 12
y - 3x = 15
 The impala is the most powerful jumper of the antelope family. When an impala jumps, its path through the air can be modeled by y+ -0.0444x^2+1.3333x where x is the impala's horiz