book Maths Puzzle Numerical Ability

express as the cofunction of a positive acute angle not using a calculator of sec -160 degrees.

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(3x-1)/(x^2+5x-6)-((2x-7)/(x^2+5x-6) Using the point slope formula, what is the equation of the line that passes through the points (1,5) and (0,0)? Please help me?