Start by finding the slope of the line that passes through both the 12 roses bouquet and the 18 roses bouquet.
point 1: (12,61)
point 2: (18,79)
[tex]\begin{gathered} m=\frac{y_2-y_1}{x_2-x_1} \\ then, \\ m=\frac{79-61}{18-12} \\ m=\frac{18}{6} \\ m=3 \end{gathered}[/tex]
then, using one of the points find the fixed costs
[tex]\begin{gathered} P=m\ast r+b \\ using\text{ \lparen12,61\rparen} \\ 61=3\ast12+b \\ 61-36=b \\ b=25 \end{gathered}[/tex]
Answer:
The general equation that represents the linear relationship is:
[tex]P=25+3r[/tex]
