Solve the system with substitution

2.5x-3y=-13
3.25x-y=-14

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

How many solutions does the nonlinear system of equations graphed bellow have?