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anonymous
 3 years ago
use the elimination method to solve the system of equations.
a+7b=7
a+2b=3
anonymous
 3 years ago
use the elimination method to solve the system of equations. a+7b=7 a+2b=3

This Question is Closed

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1subtract the 2 equations, what u get ?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0I am sorry don't understand

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1let me give you an example on how to subtract equations, let the 2 equation be say, 2x+3y =7 2x3y =2 now if i subtract the 1st equation from 2nd equation, i get (2x3y)  (2x+3y) = 27 so, 2x2x3y3y=5 06y=5 so, y = 5/6 in same manner, you try for your question of a+7b=7 a+2b=3

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1very close,but its 7b2b = 7(3) can you proceed ?

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.172 = 5 7 (3) = 7+3 =10 _

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.17b2b = 7(3) 5b = 10 b=10/5 = 2 got this ?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.07(3) since it has a minus sign in front i believed it was to be subtracted not added.

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1 *  = + so, 7  (3) became 7+3

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so the final answer would be 2

hartnn
 3 years ago
Best ResponseYou've already chosen the best response.1b=2 you still need to find 'a' put b=2 in any 1 of the original equation to get a

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0multiply the first equation by a 1. Doing this will cancel out the a's. You can then solve for b. Once you have solved b, substitute that in for b in either of the original equations and you will solve a. You can then check your answer by subbing in known variables in either of the original equations and if they equal, your answers are correct :)
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