Depending on what your question was, there are different answers:
4x + 4 = 7x - 3
7x - 4x = 4+3
3 x = 7
x =7/3
or
4x + 47x -3 = 0
51x = 3
x = 3/51
x=1/17
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If you mean: x+4x--9 = x+1 then 4x = -8 and x = -2
The lines are perpendicular.
4x + 20
Using the discriminant for a quadratic equation the value of k works out as plus or minus 12.
x can be anything, if you don't have it in an equation form, can an be an infinite amount of solutions