Suptitusikan soal 5p+q=10 dan 14p+q=18

5p + q = 10
q = 10 - 5p

14p + q = 18
14p + (10-5p) = 18
14p + 10 - 5p = 18
9p = 18 - 10
p = 8/9

5p + q = 10
5(8/9) + q = 10
(40/9) + q = 10
q = 10 - (40/9)
q = (90-40)/9
q = 50/9
q = 5 + 5/9