Question

How do you solve `X + 8y =7` and `X = 2-8y`?

Answer 1

The given equations represent a pair of parallel lines (they do not intersect) and therefore there are not solutions.

Explanation:

Given
[1]`color(white)("XXX")x+8y =7`
and
[2]`color(white)("XXX")x=2-8ycolor(white)("XXX")rarrcolor(white)("XXX")x+8y = 2`

We have declarations that `x+8y` is equal to both `7` and `2`.

Since this is clearly impossible, there are no solutions for the given pair of equations.