subtitusikan Nilai x=4 ke pers1 soal x+3y=7dan 4+3y=7 tentukan nilai y nya

x+3y=7
4+3y=7
3y=7-4
3y=3
y=3/3
y=1

fx(4)= x + 3y = 7
4 + 3y = 7
3y = 7 - 4
y = 3/3
y = 1

dibuktikan
4 + 3y = 7
4 + 3(1) = 7
7 = 7 ❲hasilnya sama❳