Question

Решить систему методом подстановки

Answer 1

$left { {{x + 5y = 35} atop {3x + 2y = 27}} right.  rightarrow left { {{x = 35 - 5y} atop {3x + 2y = 27}} right.  rightarrow left { {{x = 35 - 5y} atop {3(35 - 5y) + 2y = 27}} right.  rightarrow left { {{x = 35 - 5y} atop {y = frac{78}{13} = 6}} right. rightarrow  left { {{x = 5} atop {y = 6}} right$

Answer 2

X=35-5y 3×35-3×5y+2y=27 105-15y+2y=27 105-27-13y=0 13y=78 Y=6