maf help plssssssssssssssssssssssssss

Question

sxdsouls · Answer

System of Equations by Elimination

sxdsouls · Answer

16x-4y=28
-8x+3y=-5

dude · Answer

You want both numbers to cancel each other out

You can choose to remove either variable, which one do you want to remove? x or y?

sxdsouls · Answer

y

sxdsouls · Answer

brb rq

XioGonz · Answer

You have to add the equations in order to solve for the first variable

XioGonz · Answer

After that you'll get your value. You have to plug that value into the other equations in order to solve for the remaining variables

sxdsouls · Answer

"plug" ?

dude · Answer

kk

You want to find the lowest common factor between 4 and 3

Should be pretty straight forward
3: 3,6,9,[12],15,18,21
4: 4,8,[12],16,20

Lowest common factor is 12

Multiply each equation by its respective factor to get 12y 
$3\times(16x-4y=28)$=    $48x-12y=84$
$4\times(-8x+3y=-5)$=     $-32x+12y=-20$

We have:
$48x-12y=84$
$-32x+12y=-20$

Now you can add them up

Does this make sense?

sxdsouls · Answer

Ok makes tiny bit sense

dude · Answer

mm what confuses you?

sxdsouls · Answer

e v e r y t h i n g

sxdsouls · Answer

attachment

sxdsouls · Answer

this part

sxdsouls · Answer

add ?

dude · Answer

Yes add them up

$$~~~~~~~48x−12y=84 
\+−32x+12y=−20\
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$$

dukedadon · Answer

look at dude man, so inspirational.

sxdsouls · Answer

"different signs you subtract and take the sign of the bigger number" right ?

dude · Answer

sxdsouls wrote:

e v e r y t h i n g

The main point here is to get rid of a variable when you add both equations If you want a variable to cancel itself you want the equation to have a positive and equal negative value What I did first was to find a value that both 4 and 3 shared (which was 12) Once I found the shared value I multiplied the equation so that they both had 12y or -12y Does this make more sense?

dude · Answer

sxdsouls wrote:

"different signs you subtract and take the sign of the bigger number" right ?

Yes

sxdsouls · Answer

(4,3) is the answer I assume now

dude · Answer

Close

y isn't 3

Once you have x, you can just substitute it into either equation

Easiest would be to substitute into the second equation (You can do it with the first too)
$-8x+3y=-5$
$-8\cdot4+3y=-5$
$-32+3y=-5$
$3y=27$
$y=9$

sxdsouls · Answer

Jesus,

sxdsouls · Answer

Hey I tried tho

sxdsouls · Answer

Thank you, Appreciate your time <3

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