Equation of the Line in standard form (please note that coefficients of x and y should not be fraction): ax + by = c, where a and b should not be zero at the same time.
1) 9x - y = 40
2.) 6x + y = 99
3) 4x-y = -21
4) 6y + y = -4
5) 3x - y = -13
6) 4x + 5y = 39
7) 2x + 3y = -9
8) x - 3y = 3