Question 287088
(1) {{{y = 4x}}}
(2) {{{y = -6x + 8}}}
{{{3x = 6y + 18}}}
{{{6y = 3x - 18}}}
(3) {{{y = (1/2)*x  - 3}}}
Here are the graphs:
{{{ graph( 500, 500, -10, 10, -10, 10, 4x) }}}
{{{y = 4x}}}
{{{ graph( 500, 500, -10, 10, -10, 10, -6x + 8) }}}
{{{y = -6x + 8}}}
{{{ graph( 500, 500, -10, 10, -10, 10,(1/2)*x  - 3) }}}
{{{y = (1/2)*x - 3}}}