2. classify the equation 4x + 2 = 4x + 2
as having one solution, no solution, or
infinitely many solutions.

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?