RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 15. Linear Inequations

Subject: Maths - Class 11th

Q. No. 4 of Exercise 15.6

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Find the linear inequations for which the solution set is the shaded region given in Fig. 15.42.

In this question we will apply the concept of common solution area to find the signs of inequality by using their given equations and the given common solution area(shaded part).

If a line is in the form ax+by = c and c is positive constant(in case of negative c the rule becomes opposite), so there will be two cases to discuss, which are,

If a line is above origin :–

(i). If the shaded area is below the line then ax+by<c

(ii). If the shaded area is above the line then ax+by>c

If a line is below origin, then the rule becomes opposite.

According to the rules, the answer will be,

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