Can you show me how to solve this equation using substitution 5y+4x=8 y=5x+10

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Can you show me how to solve this equation using substitution 5y+4x=8 y=5x+10

Mathematics
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yes. since it is stated that y = 5x +10; we can just substitute that value for "y" in the other equation and slove for "x"
5(5x + 10) + 4x = 8 25x + 50 + 4x = 8 29x + 50 = 8 29x = 8 - 50 29x = -42 x = -42/29
reduce if you can...

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could you show me what I did wrong ill show you how I solved it
go right ahead :)
5y+4x=8 y=5x+10 5(5x+10)+4x=8 25x+50+4x=8 21x+50=8 21x=-42 x=-2 y=5(-20)+10 y=-10+10 y=0
That is what I did
And I was pretty sure that was the answer.
25x + 4x does NOT equal 21x
Oh sorry I made a typing misatke to y=5(-2)+10 should be the one line
Ithought you subtracted
nope; when it says 25 + 4, it actually means to add. That little (+) sign means add....
I know but I was taught that you did the opposite to get rid of it
why would you want to get rid of it? it is a vital part of the equation. Now, if it was on the OTHER side of the (=) sign, you would subtract it from BOTH sides to move it. But, if it is on the SAME side, it is simply addition.... Does that make sense?
Look at your original question that you asked. Are you sure it doesn't say -4x in the problem you were given? 5y - 4x = 8?
Hold on let me check quick
If you want to move it to the othe side of the (=) sign we do this: 25 + 4 = 29 25 + 4 (-4) = 29 (-4) 25 = 29 - 4 But when it is on the same side, just add it together: 25 + 4 = 29 29 = 29
5y + 4x = 8 y + 5x = 10 it says ''solving a system of equations by substitution''
That is a different set of equations that what you give to begin with; please verify which one is correct please...
Im sorry
The last one is the correct one
ok :) What does "y" equal then?: y = 10 - 5x substitute that "value" into the top equation to get: 5(10 - 5x) + 4x = 8 50 - 25x + 4x = 8 -25x + 4x = 8 -50 -21x = -42 x = -42/-21 = 2 Use this solid value of x=2 in the bottom equation to solve for "y" y + 5(2) = 10 y + 10 = 10 y = 10 - 10 y = 0 x = 2
OK thanks im gonna look over this for a minute
Im sorry im kinda confussed I was taught in a different way and im trying to figure this all out
I got y=5x+10
you gave, for the bottom equation: y + 5x = 10 ; to get "y" all by its little lonesome, we need to subtract (5x) from both sides to keep the same values... y +5x -5x = 10 - 5x y + 0 = 10 - 5x y = 10 - 5x Do you see it?
Not really im sorry
tell me where I am losing you then, let me know what is confusing you here. And then I can show you the right steps...
Can you tell me what the (=) sign means?
See for Y im somehow got -5x+10
-5x + 10 is correct, and it is the same thing as 10-5x am i right or wrong?
Oh so then I did have it right?
you wrote, and I quote " I got y=5x+10" earlier. If what you meant was "I got y= -5x+10" then yes, you are right...
Yeah thats what I meant im sorry I cant type today at all
:) paper and pencil is always easier when doing math
Yeah it is but thanks for showing me that now im gonna rework the problem and see if i get it right
so should the set up be 5(-5x+10)+4x=8
Yes
Ok I think im getting this down now
you are doing great :)
Thanks I have really been having a tough time this year
Does y = 2
and x=0
yes; y=0 and x=2. To double check; plug those values into the original equations to see if they are true.
Ok thanks a lot :)

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