Question

A store owner spends 7x + 13 dollars on two orders of boxes of light bulbs, including shipping. If the store owner spent a total of $90 on both orders, how much does a box of light bulbs cost in dollars?

Answer 1

Well, I believe your equation would be...
7x + 13 = 90
Now solve for x

Subtract 13 from each side
7x + 13 - 13 = 90 - 13
7x = 77

Divide each side by 7
7x ÷ 7 = 77 ÷ 7
x = 11
A box of light bulbs costs 11 dollars

Answer 2

Cost of a box of light bulb is $11

What is Linear equation?

A linear equation is an algebraic equation of the form y=mx + b

Given,

A store owner spends 7x + 13 dollars on two orders of boxes of light bulbs, including shipping

Total amount spent by the owner = $90

Therefore,

7x+13 =90

Where x is the cost  of a box of light bulb

7x+13=90

7x=77

x= $ 11

Hence, the cost of a box of light bulb is $11

Learn more about Linear equation here

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