Question 376296
7p+5q=2 multiply by 8
8p-9q=17 multiply by -7 & add.
56p+40q=16
-56p+63q=-119
-----------------
103q=-103
q=-103/103
q=-1 ans.
7p+5*-1=2
7p-5=2
7p=5+2
7p=7
p=7/7
p=1 ans.
Proof:
8*1-9*-1=17
8+9=17
17=17