exam Maths Puzzle Numerical Ability

Can anyone help me find the slope of a line with
6x+2y=8

I cannot seem to get x
I think it is 1.3

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exam Other Question
if x represents the first of three consective even integers, express the sum if the three integers in the term x V=s^3
500=s^3
Need to know how to solve for volume when only volume is given. Need step by step instructions. Thanks.