Where do the lines given by y=x+b and y=2x+1 intersect?

Can any one me with the answers to these questions asap?

What is the measure of ac? 5 units 13 units 26 units 39 units 3x- 2b 6x + 9

The table below represents a linear function f(x) and the equation represents a function g(x): x f(x) −1 −5 0 −1 1 3 g(x) g(x) = 2x − 7 part a: write a sentence to compare the slope of the two functions and show the steps you used to determine the slope of f(x) and g(x). (6 points) part b: which function has a greater y-intercept? justify your answer. (4 points)