I am really stuck on this one.
3x – 5y = 9
y = 3x + 3
3x – 5y = 9 ........................(1)
y = 3x + 3 .....................(2)
from (2) we see y = 3x + 3, substitute 3x + 3 for y in (1), we get:
3x – 5y = 9
=> 3x - 5(3x + 3) = 9
=>3x - 15x - 15 = 9
=> -12x = 24
=> x = -2
but y = 3x + 3
=> y = 3(-2) + 3
=> y = -3
so x = -2, y = -3