Respuesta :
As per linear equation, it take Emily 5 weeks to save enough money to buy the sound system.
What is a linear equation?
"A linear equation is an equation in which the highest power of the variable is always 1."
Given, Emily has saved $74 toward a new sound system that costs $149. She plans on saving an additional $15 each week.
Let, it will take Emily 'x' weeks to save enough money to buy that sound system.
Therefore, the linear equation is:
[tex]15x + 74 = 149[/tex]
⇒ [tex]15x = 149-74[/tex]
⇒ [tex]15x = 75[/tex]
⇒ [tex]x = \frac{75}{15}[/tex]
⇒ [tex]x = 5[/tex]
Learn more about a linear equation here: https://brainly.com/question/18509135
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