SOLUTION: solve equation using substitution X = y + 8 5x + 3y =12 so I put x in 5x = 5(y+8)+3y=12 = 8y + 40 = 12 now I subtract 40 and get 8y=-28 which give me -28/8 or y= -7/2, so when I

Question 837118: solve equation using substitution
X = y + 8
5x + 3y =12
so I put x in 5x = 5(y+8)+3y=12 = 8y + 40 = 12 now I subtract 40 and get 8y=-28 which give me -28/8 or y= -7/2, so when I plug into y what is my answer for X. the teacher said they a reasonable solution. But I am lost, my dad says no solution, I don't really know. Im in 8th grade algebra
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Clarifying what you tried to do:
.
Choose which way you are using in any given problem and use the variable consistently.
and , but and .

Your given system:
and ;
Most of what you show looks good.
-
You have a formula for x as one of the given equations.
Substitute...

just as you found. (You showed one arithmetic mistake, like you intended division by 4 but wrote division by 8).
-
Use the value for y to find the value of x, from your original first equation:

-
-
SUMMARY OF ANSWER RESULTS: and .
RELATED QUESTIONS
Solve each system of inequalities by graphing x+8/3y=12 1/2x+4/3y=5 I tried x+8/3y=12 (answered by stanbon)

Can you put these into y=mx+b x-y=0 5x-3y=10 and x-2y=1 5x-4y= -23 and... (answered by Alan3354,stanbon)

what is the x=y+8 5x+3y+12 i dont get systems of linear equations using substitution ive... (answered by mananth)

Hi, thanks so so much for helping me out!!! I am working on substitution and am really... (answered by rfer,cleomenius)

solve for x and y 5x - 2y = 12 4x + 3y =... (answered by mananth)

Solve using substitution: -y − 5x = -7 2y − 2x = 14 Solve using... (answered by Alan3354)

Solve and check by using substitutions mehtod Not sure if this is right y=5x 2x+y=28... (answered by rfer)

The problem states, "Solve the system of equations using substitution method". This is (answered by MathTherapy)

Solve using substitution y=x-4... (answered by Fombitz)