Question

Tentukan hasil penyelesaian sistem persamaan berikut :
a) x + 3y = 1
2x - y = 9
b) 2x + 3y = 6
2x + y = -2

Answer 1

X + 3y = 1  (x 2)
2x - y = 9   (x 1)

2x + 6y = 2
2x - y  = 9

kemdian dikurangkan jlan kebawah
5y = -7
y = -7/5

2x - y = 9
2x - (-7/5) = 9
2x + 7/5 = 9
2x = 45/5 - 7/ 5
2x = 38 / 5
x = 38/10
x = 19 / 5

b. 2x + 3y = 6
   2x + y = -2
kmudian dikurangkan
2y = 8
y = 4

2x + y = -2
2x + 4 = -2
2x = -6
x = -3