soal matematika spldv.terserah jawab no 1 atau no 2.ya penting ada caranya. THANKS

jawab

1.
misalkan
(x+1)= a
(y-2) = b

a/2 - b/3 = 3 
3a - 2b = 18

a/3 + b/5 = 2
5a + 3b = 30

3a - 2b = 18. |kali 5
5a - 3b = 30..|kali 3

15a - 10b = 90
15a - 9b = 90..|(-)

-b = 0
b = 0
3a - 2b = 18
3a -0 = 18
a = 6

x +1= a 
x +1 = 6
x = 5

y - 2 = b
y - 2 = 0
y = 2

x - y = 5 - 2
x - y = 3


2)
titikpotong
x + y = 3
x + 2y = 4..|(-)
-y = - 1
y = 1

x + y = 3
x = 3-y
x = 3 - 1
x = 2

titk (x,y)= (2, 1)