book Maths Puzzle Numerical Ability

how do u solve
(o,1)(3,-8)
into a y-intercept equation?

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book Other Question

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.45 What is the fractional equivalent? (45/100) but what does the line above the number mean? in a chem class, 7 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters are needed?

I tried : to make a chart
or .10x + .04{7 + X}= .06

I got a neg. number. Please help.