Question

Persamaan garis yang sejajar dengan 2x – y = 12 melalui (2,3) adalah ...



a. 2x + y = 4
b. 2x – y = 1
c. 2x + y = -3
d. x - y = 2

Answer 1

Verified answer

Kelas 8 Matematika
Bab Persamaan Garis

ax + by = c, sejajar, (p, q)
ax + by = ap + bq

2x - y = 12, sejajar, (2, 3)
2x - y = 2 . 2 - 1 . 3
2x - y = 4 - 3
2x - y = 1

Answer 2

Verified answer

2x - y = 12
m = -a/b
Catatan :
m = gradien
-a = angka di depan variabel x
b = angka di depan variabel y

m = -2/-1 = 2

y - y1 = m ( x - x1 )
y - 3 = 2 ( x - 2 )
y - 3 = 2x - 4
-2x + y = -1
---------------- × -1
2x - y = 1

Jawaban : B