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1.find the middle term of an ap with 17 terms whose 5th term is 23 and the common difference is -2 2.if p(x,y) is any point on the line joining the points A(a,0)and B(0,b) , then show that x/a +y/b=1 |
If P(x, y) lies on the line joining A(a, 0) and B(0, b), then the area of triangle APB = 0. a(y - b) + x(b - 0) + 0 (0 - y) = 0 ay - ab + xb = 0 xb + ay = ab  |
