The answers are in the 5th picture

Please skip 21 and 22

18. Find the point at which the line f(x) = 2x +5 intersects the line g(x) =-3x-5 19. Use algebra to find the point at which the line f (x) =-=x+ 4 274 intersects the line 5 25 73 h ( x) =-xt 4 1020. You're comparing two cell phone companies. Company A: $20/month for unlimited talk and text, and $10/GB for data. Company B: $65/month for unlimited talk, text, and data. Under what circumstances will company A save you money? Find a formula for each piecewise defined function. y 2 1 -3 -2 2 3 5 -7-6-5 -4 3-2-1 123 4 5 6 1-2- 1- -3- 21. 2223. Find the value of y if a linear function goes through the following points and has the following slope: (10, y), (25, 100), m =-5 For the following exercises, use the functions f (x) = -0.1x + 181 and g(x) = 20x + 0.1. 24. Find the point of intersection of the lines f and g. 25. Where is f (x) greater than g(x)? Where is g(x) greater than f (x)?26. Sketch an accurate picture of the line having equation f(x) = 2 - x. Let c be an unknown constant. a. Find the point of intersection between the line you have graphed and the line g (x) =1+ cx; your answer will be a point in the xy plane whose coordinates involve the unknown c. b. Find c so that the intersection point in (a) has x-coordinate 10. c. Find c so that the intersection point in (a) lies on the x-axis.16. y = -5x +57 17. y = 1/2 x + 1 18. (-2, 1) 19. (6/5, 10) 20.If you are planning to use less than 4.5 GB of data. (2x + 3, -3