Question 1088702
Let {{{ x }}} = the cost of a pencil ( in cents )
{{{ x + 30 }}} = the cost of a pen ( in cents )
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{{{ 5*( x + 30 ) + 2x = 430 }}} ( in cents )
{{{ 5x + 150 + 2x = 430 }}}
{{{ 7x = 280 }}}
{{{ x = 40 }}}
and
{{{ x + 30 = 70 }}}
A pen costs 70 cents
A pencil costs 40 cents
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check:
{{{ 5*( x + 30 ) + 2x = 430 }}} 
{{{ 5*70 + 2*40 = 430 }}} 
{{{ 350 + 80 = 430 }}}
{{{ 430 = 430 }}}
OK