SOLUTION: solve by the substitution method.
7x+4y= -1
-5x+y=20
Algebra.Com
Question 491115: solve by the substitution method.
7x+4y= -1
-5x+y=20
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
7 x + 4 y = -1 .............1
1 y = 20 + 5 x ---------2
/ 1 =
y = 20 + 5 x
Substitute y in (1)
7 x + 4 ( 20 + 5 x ) = -1
7 x + 80 + 20 x = -1
7 x + 20 x = -1 -80
27 x = -81
/ 27
x= -3
Plug the value of x in (1)
7 x + 4 y = -1
7 * -3 + 4 y = -1
-21 + 4 y = -1
4 y = 20
/ 4
y= 5
m.ananth@hotmail.ca
RELATED QUESTIONS
Solve 2x-y=9 and 7x+4y=1 by using the substitution... (answered by krice134)
solve by the method of substitution
y=-5
5x+4y=-20
(answered by Alan3354)
solve by substitution method
9x+4y= -55
-7x+y=... (answered by drj,MathTherapy)
7x-4y=13
x=3
Solve by the substitution method (answered by user_dude2008)
Solve the system by the substitution method:
x= 4y + 7
7x + y= 20
what is x and... (answered by jojo14344)
solve by substitution method
9x+7x=-47... (answered by jim_thompson5910)
Solve this system of equations by the substitution method
7x - 4y = 13 (1)
x=3 (answered by Coyote 10)
Solve the given system by the substitution method
4x+y=14... (answered by Alan3354)
solve by the substitution method
4x-4y=0... (answered by mathsmiles)