We can also form this equation. x² + xy = 22 ---(i) y² + xy = 99 ---(ii) Add (i) and (ii) x² + xy + xy + y² = 22+99 x² + 2xy + y² = 121 (x + y)² = 121 x + y = √121 x + y = 11 Then we substitute the value of x as you did. Then we can find y. After that we substitute value of y to find x.
Спасибо! Очень полезно для мозга! Вспомнила школьную программу!👍
We can also form this equation.
x² + xy = 22 ---(i)
y² + xy = 99 ---(ii)
Add (i) and (ii)
x² + xy + xy + y² = 22+99
x² + 2xy + y² = 121
(x + y)² = 121
x + y = √121
x + y = 11
Then we substitute the value of x as you did. Then we can find y. After that we substitute value of y to find x.