Question 408152
Get in the form {{{y = mx + b}}}
{{{1 + y = x}}}
subtract {{{1}}} from both sides
(1) {{{y = x - 1}}}
and
{{{x + y = 1}}}
subtract {{{x}}} from both sides
(2) {{{y = -x + 1}}}
These have different slopes, so they must be independent
Here's the plot:
{{{ graph( 400, 400, -10, 10, -10, 10, x - 1, -x + 1) }}}