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MightySmurf
Group Title
Solve this system of equations using the addition method?
xy=6
3y=x+22 Solve this system of equations using the addition method?
xy=6
3y=x+22 @Mathematics
 3 years ago
 3 years ago
MightySmurf Group Title
Solve this system of equations using the addition method? xy=6 3y=x+22 Solve this system of equations using the addition method? xy=6 3y=x+22 @Mathematics
 3 years ago
 3 years ago

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amistre64 Group TitleBest ResponseYou've already chosen the best response.1
scale the 1st by 3
 3 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
3x +3y = 18 3y = x+22  3x = x+4 4x = 4
 3 years ago

MightySmurf Group TitleBest ResponseYou've already chosen the best response.0
how do you get x+4
 3 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
by using the "addition" method ... you add the 2 equations together after you modify one of them by a scalar
 3 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
a scalar just means some number that you multiply the whole equation by to scale it up or down to something that you can use
 3 years ago

MightySmurf Group TitleBest ResponseYou've already chosen the best response.0
o so i just substitute it
 3 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
well, substitution will work as well; but this is a new method for you to learn so that you have many ways you can attack a problem to get to a solution
 3 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
this "addition" method is also commonly refered to as "elimination" since the goal is to eliminate one of the variables
 3 years ago

MightySmurf Group TitleBest ResponseYou've already chosen the best response.0
o ok thank you u make it sound easier to solve
 3 years ago

MightySmurf Group TitleBest ResponseYou've already chosen the best response.0
so if i were to have 8x+3y=5 and 8x2y=6 i would add the _8x and the 8x to get zero then 32y to get y and 5+6 to get 1 right
 3 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
practice helps :) the steps are pretty much like this: x  y = 6 ; (1) 3y = x + 22 ; (2) given 2 equations lets multiply one of them by a "n"umber to scale it. the easiest one would be the first one to me n(x  y = 6) ; (1) 3y = x + 22 ; (2) nx  ny = 6n ; (1) 3y = x + 22 ; (2) now what does "n" have to be to get rid of the 3y? id say n = 3 will work 3x  3y = 6(3) ; (1) 3y = x + 22 ; (2) 3x +3y = 18 ; (1) 3y = x + 22 ; (2) now we can add the equations together: 3x +3y = 18 ; (1) 3y = x + 22 ; (2)  3x = x + 4 ; (3) and solve the new equation (3) for the remaining variable
 3 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
if they give you: 8x+3y =5 8x2y = 6 then yes the x parts are already set up for elimintion, just add the 2 equations together
 3 years ago

MightySmurf Group TitleBest ResponseYou've already chosen the best response.0
ok thank u sooo much i would give u thousands of medals if i could
 3 years ago

amistre64 Group TitleBest ResponseYou've already chosen the best response.1
youre welcome, and good luck ;)
 3 years ago
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