nilai x-y dari persamaan 7x+5y=2 dan 5x+7y=-2

7x+5y=2 |×7| 49x + 35y = 14
5x+7y=-2 |×5| 25x + 35y = -10 -
24x = -14
x = 24÷-14
x = -1

7x+5y=2
7(-1)+5y = 2
-7 + 5y = 2
5y= 2 - (-7)
5y = 9
y = 9÷5

7x + 5x = 2. X7 = 49x + 35y = 14 5x + 7x = -2. X5 = 25 x + 35y = -10 Hasil 49x + 35y = 14 25x + 35y =-10 -> dikurangkan = 24x = 24 X = 24/24 Jadi x adalah 1 Sedangkn y Ambil satu fungsi 7x + 5y = 2 Masukan nilai x = 1 7x1 + 5y = 2 7 + 5y =2 5y =7 -2 = y 5/5 = 1