SOLUTION: simultaneous equations y=2x+1 x+y=4

Question 170935: simultaneous equations
y=2x+1
x+y=4
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
lets rewrite the 1st equation to line up the x and y and constant terms
:
2x-y=-1...eq 1
x+y=4....eq 2
:
now lets use the process of elimination. This system is already set up without have to change either equation...If you add one equation to the other you can see that the y terms are eliminated -y+y=0. now we have 2x+x and 4-1
:
2x+x=4-1--->combine
:
3x=3--->divide by 3
:

:
now we plug this found value into either original equation. I choose eq 2.
:
1+y=3--->subtract 1 from each side
:

:
you can also solve this by substitution!!
RELATED QUESTIONS
SIMULTANEOUS EQUATIONS 2x+3y=1 x+... (answered by Fombitz)

simultaneous equations x-y=4... (answered by checkley77)

Solve the simultaneous equations. 3x+4y=-3,... (answered by josgarithmetic)

i am stuck on this, please help: simultaneous equations 2x+y=-1 (answered by Simnepi,Ave,RedemptiveMath)

x^2/y +y^2/x =9 ........eq1 1/x +1/y= 3/4............eq2 solve the simultaneous... (answered by ikleyn)

solve algebraically simultaneous equations 14x+3y=1... (answered by Boreal,MathLover1)

hie,pliz help me solve the folloeing simultaneous equations log(base3)x=y... (answered by Alan3354)

Solve the simultaneous equations 64(4^y)=16^x and... (answered by mananth)

Simultaneous equations X+y=2... (answered by oscargut)