A new student has joined your study group. Write step-by-step explanations telling her how to use algebra to write the equation of a line given each of the following. Be sure to include examples. a) A point and the slope. b) Two points.

To find the average, you add all of the numbers and divide by the number of numbers (If that makes sense)

We can use variables (x) to solve for the last number.

268+258+271+x/4 = 266

Multiply both sides by 4

268+258+271+x = 266*4

268+258+271+x = 1064

Add the three numbers together

797+x = 1064

Subtract both sides by 797

x = 267

Her fourth pregnancy must last 267 days.