5x + 3y=4
5x-3y= 2
Using elimination method
5x + 3y=4 → 5x + 3y=4
-[5x-3y= 2] → -5x +3y= -2
6y = 2
y → 1/3 and x = 3/5
solving (25x2 -9y2)
25 * [3/5]2 -9 * [1/3]2
25 * 925 - 9 19
9 - 1 = 8
