4. Given L1, x - 2y = 6 and L2, x + 2y = 0. Find a) x-intercept and y-intercept of L, (2 marks) b) x-intercept and y-intercept of Lz (2 marks) c) intercept point between L, and Lz (2 marks) d) sketch the graph of L, and Lz (4 marks) 5. Given the quadratic function y = -x2 - 8x a) Find the vertex point (2 marks) b) Find the y-intercept (2 marks) c) Find the x-intercept (2 marks) d) Sketch the graph (4 marks)