Identify two methods a person can use to pay his or her bills in person and explain the advantages and disadvantages of each.
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A the slope of the line is 1
to calculate the slope m , use the ' gradient formula '
m = ( y₂ - y₁ ) /( x₂ - x₁ )
where (x₁, y₁ ) = 6, 3) and (x₂, y₂ ) = (9, 6)
m = =
= 1
