Tolong dijawab nomor 17 dan 19 beserta caranya​

17 »

-5 = -a + b

5 = 4a + b —

——————

-10 = -5a

2 = a

..

5 = 8 + b

b = -3

..

f (x) = 2x – 3

f (-6) = 2.-6 – 3 = -15 (A)

19 »

• Gradien a (ma)

ma = -2/-1

= 2

• Gradien b (mb)

ma x mb = -1

2 x mb = -1

mb = -½

• Persamaan garis melalui titik (-1,0)

y – y1 = m (x – x1)

y – 0 = -½ (x + 1)

2 (y – 0) = -1 (x + 1)

2y = -x – 1 (B/D)

maaf bila ada kesalahan