Question

Jika x-6y=-10 dan x-2y=18 bagaimana mnerjakaannya dengan cara substitusi

Answer 1

*cari nilai Y
X - 6Y + 10 = X - 2Y - 18
X - X + 10 + 18 = - 2Y + 6Y
28 = 4Y
7 = y

*cari nilai  X, dengan Y = 7
X - 6Y = -10
X - 6(7) = -10
X - 42 = -10
X = -10 + 42
X = 32

*pembuktian
X - 6Y = -10
32 - 6(7) = -10
32 - 42 = -10
-10 = -10

X - 2Y = 18
32 - 2(7) = 18
32 - 14 = 18
18 = 18

Answer 2

X - 6y = -10
x = 6y - 10    ... (1)

x - 2y = 18 ... (2)
substitusi pers (1) ke pers (2), get
6y - 10 -  2y = 18
4y - 10 = 18
4y = 18 + 10
4y = 28
y = 28/4
y = 7    ... (3)
substitusi pers (3) ke pers (1), get
x = 6y - 10
x = 6(7) - 10
x = 42 - 10
x = 32

solusi untuk (x,y) = {32 , 7}