SOLUTION: Solve using the multiplication principle first. Then use the elimination method:
7p+5q=2
8p-9q=17
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Question 376296: Solve using the multiplication principle first. Then use the elimination method:
7p+5q=2
8p-9q=17
Found 2 solutions by user_dude2008, checkley79:
Answer by user_dude2008(1862) (Show Source): You can put this solution on YOUR website!
7p+5q=2
8p-9q=17
63p+45q=18
40p-45q=85
103p=103
p=1
7p+5q=2
7(1)+5q=2
7+5q=2
5q=-5
q=-1
Answers: p=1, q=-1
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
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
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