book Maths Puzzle Numerical Ability

i have to find the slope intercept form of the equation of the line passing throught points(-1,-2)and (-4,-3) i got the answer 1/3 now i have to plug it in and solve which formula

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I really hope someone can help me out on this. I cant figure it out. Thanks.
A company specializing in magazine sales over the telephone found that in 2500 phone calls, 360 result Evacute. this is a combination problem.
5C3 x 12C10/11C7

combination method is nCr and the problem above is in nCr form.