[2] 5x = 5y + 7 [2] x = y + 7/5
Plug this in for variable x in equation [1]
[1] 3•(y +7/5) - 9y = 7 [1] - 6y = 14/5 [1] - 30y = 14
Solve equation [1] for the variable y
[1] 30y = - 14 [1] y = - 7/15
// By now we know this much :
x = y+7/5 y = -7/15
// Use the y value to solve for x
x = (-7/15)+7/5 = 14/15
Solution :
{x,y} = {14/15,-7/15}
Phew! I think i did it correctly?
