SOLUTION: I need help solving this system of equations by the substitution method:
y=2x-5
4x-y=7
Algebra.Com
Question 25539: I need help solving this system of equations by the substitution method:
y=2x-5
4x-y=7
Answer by askmemath(368) (Show Source): You can put this solution on YOUR website!
y=2x-5 (1)
4x-y=7 (2)
From (1) we know that y = 2x-5
Put this back in (2)
4x-(2x-5) = 7
4x-2x+5 = 7
2x+5 = 7
Subtracting 5 on both sides
2x = 2
Dividing by 2 throughout
X = 1
which means y = 2(1)-5 = -3
RELATED QUESTIONS
THE INSTRUCTIONS SAYS: SOLVE THE SYSTEM OF EQUATIONS USING SUBSTITUTION METHOD
1.... (answered by ankor@dixie-net.com)
how do i y=2x and x+y=12 by solving system of equations by the substitution... (answered by stanbon)
solve each system of equations by the substitution method
2x-y=-7... (answered by mananth)
I would love to have some help with solving this system of equations using the... (answered by oscargut,solver91311)
Solve the system of equations by the substitution method
y=4x+7
y=9x+8
(answered by ewatrrr)
Solve this system of equations by the substitution method.
x+4x=-1... (answered by Jstrasner)
Solve this system of equations by the substitution method.
x+4x=-1... (answered by Fombitz)
Solve the system of equations by the substitution method.
4x-y=6... (answered by josgarithmetic)
I need help solving this problem, it involves solving systems of equations by... (answered by algebrahouse.com)