Two records and three tapes cost $31. Three records and two tapes cost $29. Find the cost of each record and each tape
1 answer:
You might be interested in
Step-by-step explanation:
The slope of tangent line at a max or a minimum is 0,.
So using point slope formula.
Is the equation of a tangent line. This means we have a horizontal line at y= 4. Horizontal lines have a slope of 0.