book Maths Puzzle Numerical Ability

how would i find the slope of the line for a problem like this one

-4x-2y=-10

this problem really confuses me while looking for the slope i get lost in the numbers

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book Other Question

Q= 3,500,000+10,500P SOLVE FOR P If the sum of four consecutive even integers is less than 250, what is the greatest possible value for one of these even integers? Explain your procedure.

Thank you...p.s this is due tomorrow in school for me:(