Soal soal aumbn kls 9 tahun 2020, tolong bantu jawab ya​

Jawaban:

16.) (0,5)(2,0)

y-y1/y2-y1 = x-x1/x2-x1

y-5/0-5 = x-0/2-0

y-5/-5 = x-0/2

2(y-5) = -5(x-0)

2y-10 = -5x

5x – 2y + 10 = 0(A)

17. m = -a/b = -2/7

y – y1 = m(x – x1)

y – 1 = -2/7 (x + 5)

7(y – 1) = -2(x + 5)

7y – 7 = -2x – 10

2x + 7y – 7 + 10 = 0

2x + 7y + 3 = 0 (B)

18.) titik potong x :

-2x + 6 = 0

-2x = 6

x = -3 (3,0)

Tiktik potong y

-2.0 + 6 = 6 (0,6)

Jawabannya A.

19. 4x + 2y = 2 (dikali 2)

7x + 4y = 2 (dikali 1)

__________________

8x + 4y = 4

7x + 4y = 2

__________-

x = 2

4x + 2y = 2

4(2) + 2y = 2

8 + 2y = 2

2y = 2 – 8

2y = -6

y = – 3

jadi 2x + 5y

= 2(2) + 5(-3)

= 4 – 15

= – 11 (A)