Juliett
Juliett
05-05-2014
Mathematics
Answered
If x=2y+3 and 4x-5y=9, what is the value of y?
Answer :
actress4ever
actress4ever
06-05-2014
so we already know what x equals, so just plug it in to the other equation
now we have 4(2y+3)-5y=9
from here, just solve
y=-1
let me know if you have anymore questions :)
ps - Idk if you'd need this but x=1 :)
Answer Link
tadvisohil886
tadvisohil886
06-05-2014
We solve the system by substitution.
x = 2y + 3
4x-5y = 9
Substituting the value of x in equation no. 2 , we have,
4(2y+3) - 5y = 9
8y + 12 - 5y = 9
3y + 12 = 9
3y = 9-12 = -3
thus, 3y = -3
thus, y = -3/3 = -1
thus, y = -1
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