book Maths Puzzle Numerical Ability

can someone TEACH me how to find a boundry of a line??????(step by step)

for example--- Y>/ x+3

y>/ -x+1

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book Other Question

During a sale, the price of a book is reduced by 25%. The sale price is then further reduced by 40%. The cost of the book as a percentage of the original price is? Solve and check the equation 3(4 + 4x) = 12x + 12