SOLUTION: please show me how to do solve by addition I get confused when one equation is neg and the other is pos. like this problem x+y=2 x-y=4

Question 60649: please show me how to do solve by addition I get confused when one equation is neg and the other is pos. like this problem
x+y=2
x-y=4
Answer by praseena(37) (Show Source): You can put this solution on YOUR website!
x + y = 2
x - y = 4
Now add these two equations

x + y + x - y = 2 + 4
combune the like terms together.
x + x + y - y = 6
==> 2x = 6
now divide both sides of the equation by 2.
==> 2x/2 = 6/2
==> x = 3
thus we have got the value x = 3

now substitute the value of x in any of the given equation.
if we substitite it in the first equation,
we have, 3 + y = 2
==> y = 2-3
= -1

so solution of the equation is

x = 3 and
y = -1

Bye!!!!!!!!!!

RELATED QUESTIONS
[-3+(-6)]SQAURED - [-8-2(-3)]SQAURED I MULTIPLIED NEG 3 TO NEG 6 GOT 18. THEN SQAURED,... (answered by pwac)

solve the inequality -18 / (6x-42) >0 so neg 18 over the equation 6x-42 is greater... (answered by stanbon)

Hello I am working with the Descartes rule of signs. I am supposed to discuss the... (answered by stanbon)

Solve by graphing: x^2+y^2=25 and x-2y=-5 I graphed my circle and line perfectly but... (answered by stanbon,bucky)

I am trying to graph 3x+2y=6 I do not know if the lines on the neg or pos I am having... (answered by ankor@dixie-net.com,funmath)

I am trying to solve an equation with fractions. This is the problem 2x over x^2+6x+8 (answered by stanbon)

I am SO confused on this one, i already tried to solve this but when i checked by... (answered by ankor@dixie-net.com)

How do you solve problems like these 7-3(14)-13 THE ANSWER IS NEGATIVE 48 why is it... (answered by ewatrrr,rfer)

I was wondering if someone might be able to show me how to use the substitution process... (answered by Alan3354)