Question 720757
They all describe straight lines
To see this, put them all into the
slope-intercept form
(1) {{{ x = 2y }}}
(1) {{{ y = (1/2)*x }}}
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(2) {{{ y = x + 2 }}} ( don't have to change )
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(3) {{{ y = 2x }}} ( don't have to change )
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(4) {{{ y = (1/2)*x }}} ( same as (1) )
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These all have the form {{{ y = m*x + b }}},
where {{{m}}} = slope and {{{b}}} = y-intercept
For (1) and (3), {{{ b = 0 }}}
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Since 2 are the same, there is only 3 lines:
{{{ graph( 400, 400, -5, 5, -5, 5, (1/2)*x, x+ 2,  2x ) }}}