Question

A lemon tree costs $5 and an orange tree costs $7. Write an expression for the total cost, in dollars, of x lemon trees and y orange trees.

Answer 1

Answer:

lemon tree - $5x orange tree - $7y answer =$7y + 5x.

Step-by-step explanation:

1 lemon tree =$5

x * 1 lemon tree=$5 * x

1 orange tree=$7

1 * x orange tree = x * $7

Answer = $7y+5x

Answer 2

Answer :-

• The expression of the total cost in dollars is 5x + 7y.

What to do?

• Write an expression for the total cost in dollars of the lemon trees and orange trees.

Step-by-step explanation :-

• Here, it is given that the cost of a lemon tree is dollar 5 and the cost of an orange tree is dollar 7. We have to write an expression for the total cost of the lemon and orange trees.

Let us assume :-

• The lemon trees as "x".
• The orange trees as "y".

Now,

$\underline{ \boxed{\sf Cost = Rate \times Number \: of \:Trees}}$

Therefore, cost of the lemon trees is :-

$\bf{\longrightarrow \: x \times 5}$

$\bf{\longrightarrow \: 5x}$

Hence :-

• The cost of the lemon trees = $5x.

In the same way, the cost of the orange trees is :-

$\bf{\longrightarrow \: y \times 7}$

$\bf{\longrightarrow \: 7y}$

Hence :-

• The cost of the orange trees = $7y.

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Now, we have :-

• Cost of lemon trees = $5x.
• Cost of orange trees = $7y.

Therefore, the total cost is :-

$\underline{\boxed{\textsf{Cost of Lemon Trees + Cost of Orange Trees}}}$

$\sf{\longrightarrow \: 5x + 7y}$

$\sf{\longrightarrow \: 5x + 7y}$

Hence,

• The required expression for the total cost in dollars is $(5x + 7y).

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