Question

Tentukan himpunan peyelesaian dari SPLDV: {x+4y=-2 bawahnya {3x-2y=8

Answer 1

X + 4y = -2 --> x = -4y - 2 substitusi ke
3x - 2y = 8 --> 3(-4y -2) - 2y = 8
-12y -6  - 2y = 8
-10y = 8+6 = 14
y = - 14/10 = - 7/5
sun ke x = -4y -2
x = -4(-7/5) -2
x = 28/5 - 2 
x = 18/5