What’s the awnser too 7x+5-4x-16

The weight of full–grown tomatoes at a farm is modeled by a normal distribution with a standard deviation of 18.4 grams. the 95 percent confidence interval for the mean weight of the tomatoes is calculated using a sample of 100 tomatoes. what is the margin of error (half the width of the confidence interval)?

What can you determine about the solutions of this system

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined