Question

Solve x – 2y = 5 using the substitution method.
2x – 4y = 1

Answer 1

x – 2y = 5

first re-arrange this equation so it is
x=???

Answer 2

yes both the equations are cancelling

Answer 3

Hmmm

These equations are equivalent to
y=(x-5)/2
and
y=(2x-1)/4

both these lines have a slope of 1/2 and are therefore parallel

Draw your own conclusions from that...