Question

ecuaciones de matematica
4x = 3(7 - 3y )
3(x+6y)=19

Answer 1

$4x = 3(7 - 3y) \\ 4x = 21 - 9y \\ x \frac{21}{4} - \frac{9}{4} y$

3(x+6y)=19
3x+18y=19
3x=19-18y

x19/3 -6y