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

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hartnnBest ResponseYou've already chosen the best response.1
subtract the 2 equations, what u get ?
 one year ago

JasmineplayhouseBest ResponseYou've already chosen the best response.0
I am sorry don't understand
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
let 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
 one year ago

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

hartnnBest ResponseYou've already chosen the best response.1
72 = 5 7 (3) = 7+3 =10 _
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
7b2b = 7(3) 5b = 10 b=10/5 = 2 got this ?
 one year ago

JasmineplayhouseBest ResponseYou've already chosen the best response.0
still confused
 one year ago

JasmineplayhouseBest ResponseYou've already chosen the best response.0
7(3) since it has a minus sign in front i believed it was to be subtracted not added.
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
 *  = + so, 7  (3) became 7+3
 one year ago

JasmineplayhouseBest ResponseYou've already chosen the best response.0
ok now i understand
 one year ago

JasmineplayhouseBest ResponseYou've already chosen the best response.0
so the final answer would be 2
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
b=2 you still need to find 'a' put b=2 in any 1 of the original equation to get a
 one year ago

kelliegirl33Best ResponseYou've already chosen the best response.0
multiply 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 :)
 one year ago
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