#Help

41 messages · Page 1 of 1 (latest)

bitter kelpBOT
slender bridge
#

Alright. To solve in this system of equations, substitution seems to be the easiest solution.

misty chasm
#

I did substitution

slender bridge
#

Because in the first equation there is an x with no coefficient, you're gonna want to modify that equation.

#

Subtracting 3y from both sides results in
-x=9-3y

#

multiply the whole thing by -1 to get rid of the negative on the x

misty chasm
#

I thought you make it -4(-x+3y=9)
and then flip it to make 3(5x+4y=-26)

slender bridge
#

and you get x=-9+3y

misty chasm
#

so it turns into 4x-12y=-36
and then 15x+12y=-78

#

So -12y and +12y cancel out to solve for x

slender bridge
#

OH thats not substitution

#

thats elimination

#

i usually use substitution because it tends to be simpler

#

less steps and whatnot

misty chasm
#

Do you know how to do it my way

#

That's the way the teacher taught it

slender bridge
#

ok lemme see

slender bridge
#

to get 19x

misty chasm
#

19x=-104

slender bridge
#

and then you have 19x=-114

#

divide both sides by 19

slender bridge
#

that might be ur problem

#

i j put it in the calculator lol

misty chasm
#

-36-78 is -116

#

wait

slender bridge
#

answer should be 6

misty chasm
#

wth

#

I should use a calculator more often

slender bridge
#

lightbulb moment 🙂

slender bridge
misty chasm
#

I thought it was -39-78

#

why did I think -4(9) was -39

slender bridge
#

REAL tho

#

i used to say that 8*3 was 32 until like 5th grade LMAO

misty chasm
#

is it -114/19

#

x=-6?

slender bridge
#

yepp!

#

sorry i left for a sec there 🙂