titik C (r, r - 1) dilalui garis 2x + 3y - 32 = 0.Tentukan nilai variabel r?!

subtitusikan titik C ke pers. garisnya
2(r) + 3(r - 1) - 32 = 0
2r + 3r - 3 = 32
5r = 32 + 3
5r = 35
r = 7 

X = r
Y = r - 1
2(r) + 3(r-1) - 32 = 0
2r + 3r - 3 - 32 = 0
5r - 35 = 0
5r = 35
r = 7