`{:((x)/(2) + y = 0.8),((7)/(x + (y)/(2)) = 10):}`

solve using ellimination method (x)/(2)+y=0.8 and (7)/(x)+(y)/(2)=10

{:(0.4x + 0.3y = 1.7),(0.7x - 0.2y = 0.8):}

{:(0.4x + 0.3y = 1.7),(0.7x - 0.2y = 0.8):}

(x + y) ^ (10) = x ^ (8) y ^ (2)

The angle at which the circles x^(2) + y^(2) + 8x - 2y - 9 = 0 , x^(2) + y^(2) - 2x + 8y - 7 = 0 in tersect is

0.4 x + 0.3 y = 1.7 , 0.7 x - 0.2 y = 0.8

(2x ^ (2) + 3y ^ (2) -7) xdx- (3x ^ (2) + 2y ^ (2) -8) is = 0

(i) 7x^(2) + 16x - 15 = 0 (ii) 5y^(2)+ 8y - 21 = 0