Question

Poinnya lumayan ni
nomor 18 & 19 ya
PAKAI cara
makasih

Answer 1

18.  (y +1) / (7 + 1) = (x - 2) / (4 - 2)
 (y + 1) / 8  = (x - 2) / 2
y + 1 = 8/2  (x -2)
y + 1 = 4 x - 8
y = 4x - 9
(-3,k)
k = 4(-3) - 9
k  = - 12 - 9 = -21  (A)

19. 2x - 5y = -16  (x 2) 4x - 10y = -32
5x + 2y  = -11      (x5) 25x + 10y = -55+
                                  29 x    = -87
                                       x = -3
2x - 5y = -16
-6 - 5y = -16
10 = 5y
y = 2
7x - 8y = 7(-3) - 8(2) = -21 - 16 = -37  (A)