The equation y
=
x
+
a
y=x+ay, equals, x, plus, a is graphed in the
x
y
xyx, y-plane, where
a
aa is a positive constant. A second equation,
y
=
x
−
a
y=x−ay, equals, x, minus, a, is graphed in the same
x
y
xyx, y-plane. How do the slope and
y
yy-intercept of the graph of the first equation compare with the slope and
y
yy-intercept of the graph of the second equation?