I am having trouble with how to solve this application of linear equations.
Home Creations Inc. produces outdoor swings. For the first year, the fixed set‐up costs are $79,000. The variable cost for producing each swing is
$140. The equation that represents the cost(y) of producing (x) number of
swings is: y = 140x + 79,000
Find the cost of 500 swings:

Find the number of swings that Home Creations Inc. can produce for $100,000: