exam Maths Puzzle Numerical Ability

I have to find the slope and y-intercept of the line represented by the following eqautions. I am at a total lost. The eqaution is as follows

y=4x-3

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exam Other Question

Solve: 10= ________
V 5m + 1 + 6
(10 equals the square root of 5m+1, plus 6)

Please help with this problem! This one stumps me and the book if NO help, no examples

given that (3x-a)(x-2)(x-7)=3x^3-32x^2+81x-70, determine value of a????

I had no idea where to start.