tolong bantuin pake cara substitusi 4x-1/2y=3 12x+7y=26

Question

Matematika Diposting : 2014-10-31 Diupdate : 2018-10-25 krismayanty

Pertanyaan

tolong bantuin pake cara substitusi
4x-1/2y=3
12x+7y=26

Answer 1

4x-1/2y=3 |*3 ~> 12x-3/2y=9
12x+7y=26|*1 ~> 12x+ 7y =26_
17/2y=-17
y = -17 : 17/2
y = -2

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

Answer 2

4x-1/2y=3 |*3 ~> 12x-3/2y=9
12x+7y=26|*1 ~> 12x+ 7y =26_
17/2y=-17
y = -17 : 17/2
y = -2

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