book Maths Puzzle Numerical Ability

subtract the following polynomials:

(6x^2-2x-9)-(-10-2x+6x^2)

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book Other Question

A survey was made on the smoking habits of the male population above 18 years old of a certain community. The survey was on three cigarettes A, B and C. The following was the resul Find the equation of the line that passes through points (7,-2) and (5,-1)
Write the equation of the line in slope-intercept form.

I know the the slope intercept for is y = mx +b