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y= 2x+1
3x+y= 16⇒y= -3x+16
2x+1 = -3x+16
2x+3x=16-1
5x =15
x =15:5
x =3
substitusikan nilai x(3) ke salah satu persamaan
y=2x+1
y=2.3+1
y=6+1
y=7
titik potong antara kedua garis adalah (3,7)