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anonymous
 4 years ago
3x+2y=9
10x+5y=5
solve using procces of elimation
anonymous
 4 years ago
3x+2y=9 10x+5y=5 solve using procces of elimation

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cwrw238
 4 years ago
Best ResponseYou've already chosen the best response.0start by multiplying equation 1 by 5 and equation 2 by 5 then subtract to eliminate y

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0so in the first equation do i multiply by 5?

cwrw238
 4 years ago
Best ResponseYou've already chosen the best response.0yes  dont forget multiply every term by 5

asnaseer
 4 years ago
Best ResponseYou've already chosen the best response.1you need to multiply equation 1 by some number (call it A) and equation 2 by some other number (call it B) such that either the coefficients of x or y become the same.

asnaseer
 4 years ago
Best ResponseYou've already chosen the best response.1so for x (for example) we need 3A = 10B or for y, we need 2A = 5B

asnaseer
 4 years ago
Best ResponseYou've already chosen the best response.1can you think of what A and B should B to make either of these two equal?

asnaseer
 4 years ago
Best ResponseYou've already chosen the best response.1ok, lets say we want to eliminate y, then we need to find two numbers A and B such that: 2A = 5B we could pick A=5 and B=2 to get: 2*5 = 5*2

asnaseer
 4 years ago
Best ResponseYou've already chosen the best response.1so now if we multiply the first equation by 5 and the second one by 2 we get: 5(3x + 2y) = 5(9) ==> 15x + 10y = 45 2(10x + 5y) = 2(5) ==> 20x + 10y = 10

asnaseer
 4 years ago
Best ResponseYou've already chosen the best response.1now we have two equations where the coefficients of y are the same, so we can subtract one from the other to eliminate y. do you know how to do that?

asnaseer
 4 years ago
Best ResponseYou've already chosen the best response.115x + 10y = 45  equation 3 20x + 10y = 10  equation 4 equation 3 minus equation 4 will give us: (15  (20))x = 45  (10) (15 + 20)x = 45 + 10 35x = 35 x = 1 you can now substitute this back into either your first or second equation to find y.
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