# CBSE Class 10-Mathematics: Chapter –3 Pair of Linear Equation in Two Variables Part 11

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**Question 16:**

ABCD is a rectangle, find the values of x and y.

**Answer:**

On adding (i) and (ii),

**Question 17:**

Given the linear equation , write another linear equation in two variable such that the geometrical representation of the pair so formed is

(a) Intersecting lines

(b) Parallel lines

(c) Overlapping

**Answer:**

another linear equation representing.

(a) Intersecting lines is

(b) Parallel lines

(c) Overlapping

**Question 18:**

Find the value of for which the system of equation has infinitely many solutions

i.e.

if

Or if

Or if

If

**Question 19:**

Find the relation between a, b, c and d for which the equations and have a unique solution.

**Answer:**

Or

**Question 20:**

Solve for and :

**Answer:**