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Bethany sells roses and petunias. The expression
3r+2.5 p gives the cost (in dollars) of
r roses and
p petunias.
What is the cost of 7 roses and 8 petunias?

You might need: 想 Calculator $\newline$ Bethany sells roses and petunias. The expression $3 r+2.5 p$ gives the cost (in dollars) of $r$ roses and $p$ petunias. $\newline$ What is the cost of $7$ roses and $8$ petunias?

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Write and solve direct variation equations

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Q. You might need: 想 Calculator

\newline

Bethany sells roses and petunias. The expression

3 r+2.5 p

gives the cost (in dollars) of

r

roses and

p

petunias.

\newline

What is the cost of

7

roses and

8

petunias?

Identify Given Expression: Identify the given expression and the values to substitute. $\newline$ The cost of roses and petunias is given by the expression $3r + 2.5p$ , where $r$ is the number of roses and $p$ is the number of petunias. We need to find the cost for $7$ roses ( $r = 7$ ) and $8$ petunias ( $p = 8$ ).
Substitute Values: Substitute the values of $r$ and $p$ into the expression. $\newline$ Substitute $r = 7$ and $p = 8$ into the expression $3r + 2.5p$ . $\newline$ Cost $= 3(7) + 2.5(8)$
Perform Multiplication: Perform the multiplication. $\newline$ Calculate the cost of roses: $3(7) = 21$ dollars. $\newline$ Calculate the cost of petunias: $2.5(8) = 20$ dollars.
Add Costs: Add the costs of roses and petunias to find the total cost. $\newline$ Total cost = cost of roses + cost of petunias $\newline$ Total cost = $21$ + $20$
Calculate Total Cost: Calculate the total cost. $\newline$ Total cost = $\(41\) dollars.

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