exam Maths Puzzle Numerical Ability

how do i find sloope of an equation that looks like this
X-2/3y=1/4

and
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.
.
2X-5Y=0

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exam Other Question

An 80 % idodine solution is to be mixed with a 40% iodine solution. How much of each should be used to get 12,000 milliliters of a 64% iodine solution? hello please help me i dont understand this proof im confused thanks alot i appreciate it

u need the book to solve it

its Problem number 20 on page 138