exam Maths Puzzle Numerical Ability

I am trying to solve this equation for y:
2y + 4x = 8

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exam Other Question

I need to solve for b

1/a + 1/b=c find the slope of the line containing the following

1)(-1,6)and(0,3)
2)(12,-1)and(34,2)
3)(6,6)and(7,4)

THANKS A LOT VERY MUCH !!!!!!!!