book Maths Puzzle Numerical Ability

Factor the quadratic expression completely, and find the roots of the expression.

6x^2 - 42x + 72

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book Other Question

Can't figure out two problems. I am to determine whether the following is consistent, inconsistent, or dependent. If consistent find solution.

First problem:
6x + 4y = 8
9x + How do I write an equation for the line that has a slope and y-intercept of 3?

Also, how do I write an equation for a line that has a y-intercept of -1 and is perpendicular to a line that has a slope of -1?

Thanks for your help!