Grafik garis lurus 1.Diket:A(p,-2) dilalui garis y=7x + 19 B(5,q) dilalui garis 6x - 5y=60 C(r,r-1) dilalui garis 2x+3y-32=0 Tentukan nilai variabel p,q,dan r!

a) A ( p, -2) dilalui garis y = 7x + 19, maka
-2 = 7.p + 19
7p = -2 - 19
7p = -21
p = -21/7 = -3
b) (5,q) dilalui garis 6x - 5y = 60, maka
6.5 -5q = 60
30 - 5q = 60
-5q = 60 - 30
-5q = 30
q = 30/-5
q = -6
c) (r. r -1) dilalui garis 2x + 3y -32 = 0, maka
2.r + 3(r - 1) -32 = 0
2r + 3r -3 -32 = 0
5r -35 = 0
5r = 35
r = 35/5
r = 7