Question

What are the coordinates of these two equations after solving using substitution?
2x-y=-11 and x+4y=17

Answer 1

Do you have anything to replace the variables with?

If not, then I think you should replace x by 0 and find y. Then replace y by 0 and find x.

Maybe, not sure.

Answer 2

an equation has no coordinates.

If you want the coordinates of the two lines' intersection, then just solve for x and y.

The first equation tells you that

y = 2x+11

so use that in the 2nd equation and you have

x+4(2x+11) = 17
x+8x+44 = 17
9x = -27
x = -3
Now, y = 2x+11 = 2(-3)+11 = 5

So, the lines intersect at (-3,5)

Just to be sure, check that (-3,5) lies on each of the original lines.