SOLUTION: I need to solve this by elimination and get an ordered pair
5r-7s=-28
7r+5s=94
can someone please help me I cant get the right answer, thank you
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-> SOLUTION: I need to solve this by elimination and get an ordered pair
5r-7s=-28
7r+5s=94
can someone please help me I cant get the right answer, thank you
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Question 250374: I need to solve this by elimination and get an ordered pair
5r-7s=-28
7r+5s=94
can someone please help me I cant get the right answer, thank you
You can put this solution on YOUR website! Okay, let's multiply the top one by five and the bottom one by seven and get
5r-7s=-28
7r+5s=94
becomes
25r - 35s = -140
49r + 35s = 658
then add equations...notice the esses drop out...
74r = 518 now divide by 74 and get
r = 7 now substitute that back in to either of the original equations and get...
5(7) - 7s = -28
35 - 7s = -28
-7s = -63
s = 9
Your ordered pair is then (7, 9).
