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anonymous
 5 years ago
Solve using the elimination method. If the system has an infinite number of solutions, use set builder notation to write the solution set. If the system has no solution, state this.
x + 9y = 79
7x + 9y = 23
anonymous
 5 years ago
Solve using the elimination method. If the system has an infinite number of solutions, use set builder notation to write the solution set. If the system has no solution, state this. x + 9y = 79 7x + 9y = 23

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0eliminate y's by multiplying first equation by 1

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0x  9y = 79 would that be right for the first one?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so you should get 8x=56 right?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so x=7 plug x into second eqn to get y

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the ys cancel and you have x + 8x and 79 + 23

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0oh okay. so you use it to both equations after you solve the first one?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you can pick one equation to plug back into to get the other variable...preferably the one you didn't alter

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0plug both x and y into both original equations to check

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.079(8)=79 772=79 79=79 TRUE

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0OK. So what do I do after I plug it into the second equation?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.07(7)+9(8)=23 49+72=23 23=23 TRUE

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0solve for y then combine (x,y) for solution (7,8)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0So, (7,8) would be the answer correct? That's what I got.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Thank you so much. How would I know if an equation has no solution or infinite solutions?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0no solution would give you different numbers on each side of equal side such as 2=0 and infinite solutions would give you same number on each side like 5=5

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0parallel lines have no solution and same line have infinite solutions so if you put them in y=mx+b form and look at slope (m)same for parallel

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0welcome...medal or fan me please :)
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