Question 334822
y = -4x - 7 ---------(1)
y = 3x 

Solution:
Substitute y = 3x in the first equation.
So, 3x = - 4x - 7
==> 3x + 4x = -7 {transposing -4x to LHS)
==> 7x = -7
==> x = -7/7
==> x = -1
So now y = 3x
         = 3 (-1)
         = -3
Thus x = -1 and y = -3.