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persamaan 2 = 2x + 4 - y +1 = 4 = 2x-y+5=4
dari pers 1 --> x = 7-2y
masukkan x ke pers 2 = 2(7-2y)-y+5=4
14-4y-y+5=4
-5y=4-19
-5y=-15
y=3
cari x masukkan y ke pers 1
x+2*3=7
x=7-6 = 1
2(x+2) - 1(y-1) = 4 (hasil baris kedua kali kolom 2)
x + 2 + 2y -2 = 7
x + 2y = 7 (persmaan 1)
2x + 4 -y +1 = 4
2x + 4 - y + 1 = 4
2x - y = -1 (persmaan 2)
b. ada di gambar yang kuupload
c. x + py - 16 = 0 (masukan titik (1,3)
1 + 3p - 16 = 0
3p -15 = 0
3p = 15
p = 5