SOLUTION: solve the system of equations 3r - 4s =0 and 2r + 5s = 23

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Question 320955: solve the system of equations 3r - 4s =0 and 2r + 5s = 23
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.3r+-4s+=0
2.2r+%2B+5s+=+23
From eq. 1,
3r=4s
15r=20s
Multiply eq. 2 by 4,
8r%2B20s=92
Substitute for 20s,
8r%2B15r=92
23r=92
highlight%28r=4%29
Then find s,
20s=15%284%29
s=60%2F20
highlight%28s=3%29