Heidi is saving for a new bike. She has already saved $57. If Heidi earns
$9 per hour babysitting, how many hours does she need to babysit to
afford the bike which costs $129? Write and solve a linear function to solve.
Type your answer as an integer.

The linear equation is the algebraic form of equation whose variable has the exponent of one. It is the combination of two variables and a constant value present in them.

For the given situation,

Heidi's savings = $57

Amount for babysitting per hour = $9

Total cost of the bike = $129

Let us consider 'x' for hours she needs to babysit.

This can be represented as linear equation as

[tex]57 +9h=129[/tex]

⇒ [tex]9h=129-57[/tex]

⇒ [tex]9h=72[/tex]

⇒ [tex]h=8[/tex]

Hence we can conclude that Heidi needs to babysit for 8 hours to afford the new bike.

Learn more about linear equation here

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Heidi is saving for a new bike. She has already saved $57. If Heidi earns $9 per hour babysitting, how many hours does she need to babysit to afford the bike which costs $129? Write and solve a linear function to solve. Type your answer as an integer.

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What is the linear equation?

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Heidi is saving for a new bike. She has already saved $57. If Heidi earns
$9 per hour babysitting, how many hours does she need to babysit to
afford the bike which costs $129? Write and solve a linear function to solve.
Type your answer as an integer.