book Maths Puzzle Numerical Ability

(1,4) (5,7)

solve this equation in standard form of the line that passes through the two points...I do not understand what to do...

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a chemist has one solution that is 60% chlorinated and another that is 40% chlorinated. How much of each solution is needed to make a 100 L solution that is 50% chlorine? Use the discriminat to determine how many real number solutions the quadratic equation -4j^2 + 3j-28=0 has