Tentukan HPnya: 7x + 4y = 1 5x + 2y = -1 Makasih kak :)

7x+4y=1
5x+2y=-1

jawab:

M. Eliminasi

Elim. x
7x + 4y = 1 |×5=>35x+20y=5
5x + 2y = -1 |×7=>35x+14y=-7

35x+20y=5 - 35x+14y=-7
=6y=12
=y=2


Elim. y
7x + 4y = 1 |×1=>7x + 4y = 1
5x + 2y = -1 |×2=>10x + 4y = -2

7x+4y=1 - 10+4y=-2
=-3x=3
=x=-1

Hp={-1,2}