Solve by elimination method?
7r + 3s = 38
Find the solution as an ordered pair.
Favorite Answer
(2,8)
3r-7s= -50
7r+3s= 38
mult. to make your r’s cross out (or you can do with s’s but i choose r’s)
21r-49s= -350
-21r-9s= -114
the r’s cross out and leaves you with
-49s= -350
-9s= -114
combine everything
-58s=-464
so s=8. the plug that into one of the previous equations and you get r=2. so the answer is (2,8).
if you have any more math q’s ask me cuz i’m a major math geek. hope this helps peace dude.
7(3r-7s)=-50———- 21r-49s=-350
-3(7r+3s)=38———- -21r-9s=-114
Adding the two equations together causes the r terms to cancel leaving you with just -58s=-464
The negative signs cancel each other so you can just drop them and make both sides positive
58s=464
s=464/58= 232/29=8
Plug this back into either equation to solve for r
7r-3(8)=38
7r-24=38
7r=38+24
r=(38+24)/7=62/7
your ordered pair is just (62/7, 8)
Then you can add the two equations; the s term disappears because you’re subtracting 21s from 21s. Now you can solve for r and substitute that value into one of the two equations to get the value of s. (Check your work by substuting the value in the other equation to make sure you get the same answer.)
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