Question

Solve the simultaneous equation:
x+y=6
2x+y=8

I don't want a graph on this one...
Show me how to use the addition method and/or the substitution method.
Sorry I got brain freeze on this one x_x

Answer 1

since each equation contains +y, if we subtract the y will disappear

x+y=6
2x+y=8 subtract:
-------
-x = -2
x = 2

Now substitute x = 2 into first equation:

2 + y = 6
y = 6-2 = 4

solution x=2,y=4

thats it - done

Answer 2

the answer is (2,3) .... so it's suppose to be x=2, y=3 ....

Answer 3

no thats wrong
try plugging in x=2 and y=4 into each of the equations:
2 + 4 = 6
and 2(2) + 4 = 8

Answer 4

I used the elimination message

some teachers call it the addition method and would multiply the first equation by -1 so the equations are then added to eliminate y,

this is not really necessary as you can just subtract

Answer 5

Nvm, I found the real solution. And it is (2,3) :-)
Thank you for taking your time though.