exam Maths Puzzle Numerical Ability

solve by substitution method y=-x+6 y=-2x+7 y=x-5 2x+3y=-1
y=-x-3 -2x+y=-3 4x+y=15 3x-3y=-4

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exam Other Question
How do I solve this equation for p?
log(p/(1-p))=-3.059 How would I find the slope of the line through points (15,1) and (4,2)?