Solve simultaneous Equation
2x+5y=0
3x-4y=23

x = 5, y = -2

Step-by-step explanation:

Multiply the top equation by 4 and the bottom equation by 5:

Add these two equations to eliminate y, and then solve for x.

Substitute 5 for x in 8x + 20y = 0, and then solve for y:

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

answer: both chords and diameters have two endpoints on a circle. diameters must intersect the center of a circle.