Tlng dikrjin yhhh soal nyh hrs dikmplin skrng plissss​

6.

x – y = -7

x + 2y = 8

——————– –

-3y = -15

y = 5

x – y = -7

x – 5 = -7

x = -7 + 5

x = -2

HP = {(-2, 5)}

Jawaban  B

7.

garis pertama melalui (-1, 0) dan (0, 2)

(2)x + (-1)y = (2) . (-1)

2x – y = -2

garis kedua melalui (2, 0) dan (0, 8)

(8)x + (2)y = (8) . (2)

8x + 2y = 16

———————– sederhanakan

4x + y = 8

Jawaban B