Question

8x-y=19, y+3x=7 Ax+By=c form

Answer 1

8x-y=19 is already in your Ax+By=C form

For your second one you need to switch your x and y around so

3x+y=7 gives you your Ax+By=C form

Now you want to use the system of elimination to solve the system of equations

So when you take 8x-y=19 you then add 3x+y=7

8x+3x= 11x

-y+y=0 (crosses out... why it's called elimination)

19+7=26

Your equation is now 11x=26

You then divide both sides by 11 to get

x=26/11

(Hope this helps ya ;)