SECTION C
Q.17. Find the area of a rhombus whose vertices taken in order are the points (3, 0), (4, 5), (– 1, 4) and (– 2, – 1). 3
Sol. Let A (3, 0), B (4, 5), C (– 1, 4), D (– 2, – 1)
Using distance formula
Diagonal AC,
Q. 18. Solve the following system of equations for x and y:
Sol.
Or
For what values of a and b does the following pair of linear equations have an infinite number of solutions?
2x + 3y = 7
a (x + y) – b (x – y) = 3a + b – 2
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