Question

3x+4y=18 5x+3y=19 encontre o valor d x e y

Answer 1

| 3x + 4y = 18 ×(-5)
| 5x + 3y = 19 ×3

| -15x - 20y = -90
| 15x + 9y = 57
-------------------------
-11y = -33
y = 3


3x + 4y = 18
3x + 4.3 = 18
3x + 12 = 18
3x = 6
x = 2