Question

X=y-10 Dan x=2y+8 metode substitusi

Answer 1

x = y - 10     ...pers.1

x = 2y + 8   ⇒ x - 2y = 8     ...pers.2

Substitusikan pers.1 ke pers.2

x - 2y = 8

(y - 10) - 2y = 8

y - 10 - 2y = 8

y - 2y = 8 + 10

-y = 18

y = -18

Substitusikan "y = -18" ke pers.1

x = y - 10

x = -18 - 10

x = -28