Tolong caranya dong nomor 4 dan 5 makasiihh

4.
*Eliminasi*
7x + 4y = 1 (dikalikan 1 ) jadi 7x + 4y = 1
( – )
5/4x + ½y = -¼ (dikalikan 8) jadi 10x + 4y = -2
menghasilkan
-3x = 3
x = -1 ✓

*masukkan nilai x ke pers.1*
7x + 4y = 1
7(-1) + 4y = 1
-7 + 4y = 1
4y = 8
y = 2

Jadi, ( x , y ) = ( -1 , 2 )

5.
*Eliminasi*
5x – 2y = 17 (dikali 3) jadi 15x – 6y = 51
( + )
2x + 3y = 3 (dikali 2) jadi 4x + 6y = 6
menghasilkan
19x = 57
x = 3 ✓

*masukkan nilai x ke pers.2*
2x + 3y = 3
2(3) + 3y = 3
6 + 3y = 3
3y = -3
y = -1 ✓

Jadi, nilai ( x , y ) = ( 3 , -1 )