2x *3y=108 2x +3y=31

Question

2x *3y=108 2x +3y=31

Answer 1

2 * Х + 3 * Y = 31

X  * Y = 18

Из первого равенства  Х = 15,5 - 1,5 * Y

Y * (15,5 - 1,5 * Y) = 18

1,5 * Y² - 15,5 * Y + 18 = 0

Y₁ = 4/3           Y₂ = 9

X₁ = 13,5          X₂ = 2