Question

решите систему уравнения:

x+y=10.
2x+3y=26.

Answer 1

$left { {{x+y=10} atop {2x+3y=26}} right. left { {{x=10-y} atop {2(10-y)+3y=26}} right. left { {{x=4} atop {y=6}} right.$

2(10-y)+3y=26
20-2y+3y=26
-2y+3y=26-20
y=6

x=10-6
x=4