Question 574324
{{{ y = 40 + 40x }}}
(a) {{{ graph( 400, 400, -2, 10 , -50, 300, 40 + 40x) }}}
(b) The slope is the rate he charges, $40/hr
The slope is {{{ 40/1 }}} dollars/days
(c) The y-intercept is where {{{ x = 0 }}}, or where
there is no time charged, just the $40 for travel
(d) {{{ 240 = 40 + 40x }}}
Subtract {{{ 40 }}} from both sides
{{{ 40x = 200 }}}
{{{ x = 5 }}}
David worked 5 hrs