hallo semua tolong di bantu yaa... say..

4x + 3y = 21 × | 1 |
2x - y. = 3. × | 2 |
----------------------------

=4x+3y =21
4x-2y. =6
___________--
5y = 15
y= 3

4x+3y=21
=4x=21-9
4x=12
x=3
3x-2y
=3(3)-2(3)
=9-6
=3

*semoga bermanfaat...jadikan jawaban terbaik ya;)

4x + 3y = 21
2x = y + 3 => 2x - y = 3

4x + 3y = 21 (× 1)
2x - y = 3 (× 3)

4x + 3y = 21
6x - 3y = ...9
-------------------- +
10x = 30
x = 30/10
x = 3

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


3x - 2y
= 3(3) - 2(3)
= 9 - 6
= 3

Jadi nilai 3x - 2y adalah 3