Question 1135989
The Ann Saleslady example
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Points (x,y) for x number of phones and y wages
(10, 600) and (20, 600+100)
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FORM:  y=mx+b
{{{m=100/20=5}}}
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{{{mx=y-b}}}
{{{b=y-mx}}}
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{{{b=600-5*10}}}
{{{b=600-50}}}
{{{b=550}}}
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{{{highlight(y=5x+550)}}}
The question parts i, ii, iii, & iv  can be answered from that.