Question

Tolong alo donk nomor 19 & 20

Answer 1

19 .a 
20.a

no 20 agak susah

Answer 2

19. 5 robot + 8 mobil"an + diberikan 2 robot = 5x + 8y + 2x = 7x + 8y (d)
20. (10-x)^2 - (8-x)^2 = 28
((10-x)(10-x)) - ((8-x)(8-x)) = 28
(100 - 20x + x^2) - (64 - 16x + x^2) = 28
36 - 4x = 28
-4x = 28 - 36
-4x = -8
x = 2.
Panjang sisi sebenarnya = (10-x) m = (10-2) m = 8 m
Luas tanah sebenarnya = s^2 = 8^2 = 64 m^2 (c)