Tentukan himpunan penyelesaian dengan substitusi : A. 4x + 3y = 34 5x + y = 37 B. 2x + 3y = 1 3x + y = 5 Make caranyaa yaa Tlong, makasih

A. Penyelesaian
(1) 4x + 3y = 34
(2) 5x + y = 37

Substitusikan! cari x!
4x + 3y = 34 |×1
5x + y = 37 |×3

4x + 3y = 34
15x + 3y = 111
___________ -
-11x = -77
x = 7

Cari y!
4(7) + 3y = 34
28 + 3y = 34
3y = 6
y = 2

B. Penyelesaian
(1) 2x + 3y = 1
(2) 3x + y = 5

Substitusikan! Cari x!
2x + 3y = 1 |×1
3x + y = 5 |×3

2x + 3y = 1
9x + 3y = 15
__________ -
-7x = -14
x = 2

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