use the echelon method to solve system of equalities
X+y=10
5x-y=44

Question

shayaan_mustafa · Answer

hello tishagwen. are you there?

shayaan_mustafa · Answer

hello mr.

anonymous · Answer

sorry yea im here

anonymous · Answer

and its mrs.. ")

shayaan_mustafa · Answer

oh .. hehehehhehe... mrs. or right. let us solve it.
Well I don't know how to use arrays on this site. so kindly. try to understand me.

anonymous · Answer

the problem changed sorry

shayaan_mustafa · Answer

yes. what is it?

anonymous · Answer

X+y=10 5x-y=44

shayaan_mustafa · Answer

miss it is the same question that you've posted.

anonymous · Answer

if i understand right.. ill need to take the first set and multiply by 5 and the the 2nd one multiply by-1 right?

shayaan_mustafa · Answer

no no. here you are solving the equation with Gauss elimination method(Echelon form).

anonymous · Answer

oh ok

shayaan_mustafa · Answer

so first write equation as matrices form.
1   1   10
5   -1   44

OK?

anonymous · Answer

got it

shayaan_mustafa · Answer

ok  now
Replace row 2 (i.e. R2) with the row operation R2 new=-4*R1+R2 in order to convert some elements in the row into the desired value 0.

shayaan_mustafa · Answer

do this step. then tell me.

anonymous · Answer

x-5y=-34

shayaan_mustafa · Answer

no no my dear.

shayaan_mustafa · Answer

do the row operation on R2(row 2)

anonymous · Answer

what do you mean

shayaan_mustafa · Answer

means. multiply R1 with 4 and minus it from R2 i.e. R2new=R2-4R1
Does this make sense to you?

anonymous · Answer

not really
i know nothing of the matrix stuff

shayaan_mustafa · Answer

now look at pic and here I am going to solve it for you. keep the pic in mind. OK

anonymous · Answer

how did u get 4 i thought it was 5

shayaan_mustafa · Answer

yes yes it is 5 sorry. it is a mistake.

anonymous · Answer

ok

shayaan_mustafa · Answer

step#2) multiply R1 with 5|dw:1332792360847:dw|