jika diketahui spldv 4x+3y=13 dan 4x-3y=-29,maka nilai 2x+3y adalah...

4x+3y=13
4x-3y=-29
6y=42
y=7

4x+3y=13
4x+3(7)=13
4x=13-21
4x=-8
x=-2

2x+3y
=2(-2)+3(7)
=-4+21
=17

Kelas 8 Matematika
Bab 4 - SPLDV

Eliminasi
4x + 3y = 13
4x - 3y = -29
__________ _
6y = 42
y = 42/6
y = 7

Substitusikan nilai y
4x + 3y = 13
4x + 3(7) = 13
4x + 21 = 13
4x = 13 - 21
4x = -8
x = -8/4
x = -2

2x + 3y = 2(-2) + 3(7)
2x + 3y = -4 + 21
2x + 3y = 17