Figure 1:
The blue curve is the graph of the equation
𝜑
1
(
𝑥
,
𝑦
)
=
0
with the vertical asymptotic line
√
𝑥
=
(
5
−
1
)
/
2
and the green curve is the graph of
𝜑
2
(
𝑥
,
𝑦
)
=
0
with the vertical asymptotic line
𝑥
=
1
.