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huntaz556
Group Title
how to do 7x  3y = 20

5x + 3y = 16
with elimination?
 2 years ago
 2 years ago
huntaz556 Group Title
how to do 7x  3y = 20  5x + 3y = 16 with elimination?
 2 years ago
 2 years ago

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Mrs.Math101 Group TitleBest ResponseYou've already chosen the best response.1
the 3y cancels out, so 7x+5x=12x and 20+16= 36so the new equation is 12x=36
 2 years ago

ravi623 Group TitleBest ResponseYou've already chosen the best response.3
add two equations and u will get 12x=36 so x=3, put this value of x in any equation, u will get the value of y
 2 years ago

huntaz556 Group TitleBest ResponseYou've already chosen the best response.0
I thought with elimination you were supposed to multiply one of the equations to make it the same as the other? Im not completely sure thats why i asked here :P
 2 years ago

GT Group TitleBest ResponseYou've already chosen the best response.0
Well, you do need to multiply one or both equations to make the coefficient of one of the variables same (constant before the variable). In this case, the coefficient of y is already the same (3). So, you don't need to multiply to do elimination.
 2 years ago

GT Group TitleBest ResponseYou've already chosen the best response.0
If you had for example x + 2y = 5 2x + y = 7 Then, you will have to multiply the second equation by 2 to eliminate y. Or, multiply the first equation by 2 to eliminate x.
 2 years ago

sunsetlove Group TitleBest ResponseYou've already chosen the best response.1
good work
 2 years ago
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