Question

solving systems of linear equations help please!

Answer 1

x+y=7, and x-y=1 I missed class and don't know how to do these can you not just answer but also explain please

Answer 2

solve for x in then substitute it into the other equation. x=7-y so then (7-y)-y=1 solve for y and you get 4 then plug that into either equation to find x.

Answer 3

in one equation*

Answer 4

\[x+y=7[1]\]
\[x-y=1[2]\]
Elimination method.
\[[1]-[2]\]
\[(x+y)-(x-y)=(7)-(1)\]
\[x+y-x--y=7-1\]
x's cancel out.
\[y+y=6\]
\[2y=6\]
\[y=3\]
TO find the x-value, substitute the y-value into one of the two equations given above by me (ie. [1] or [2])

Answer 5

thank you for your help