Question

Soal UN 2017 matematika.diketahui x-3y-5=0 dan 2x-5y=9 .tentukan nilai dari 3x +2y!

Answer 1

Jawabannya 4, carannya di foto

Answer 2

X-3y = 5
2x-5y =9

2x-6y = 10
2x-5y = 9 _

-y = 1
y=- 1

x-3(-1) =5
x+3=5
x = 2

3x+2y= 3(2)+2(-1) = 6-2= 4

Cara lain

x =3y+5
x = (5y+9)/2

3y+5= (5y+9)/2
6y+10 =5y+9
6y-5y = 9-10
y= - 1

x= 3y+5
x= 3(-1)+5
= 2
3x+2y = 3(2)+2(-1)=4