If A = (4x + y - 12xy + 9z), B = (3y + 9x + 6xy - 7z), C = (6x + 6y + 9xy) Find 2A - 3B + 4C.
Solve x and y using substitution method: √7x +√13y=0 ; √5x +√17y=0
The linear expression equivalent to 5x - 2y - 3( 8x + 5y ) is -19x + 17y.