Question

Selesaikan x-10y=23dan3x-5y=19 dalam bentuk sistem persamaan linier dua variabel

Answer 1

X - 10y = 23
x = 23 + 10y

3x - 5y = 19
3(23+10y) - 5y = 19
69 + 30y - 5y = 19
25y = 19 - 69
y = -50 : 25
y = -2

x = 23 + 10y
   = 23 + 10(-2)
   = 23 - 20
   = 3

x = 3
y = -2