The equations x+y+z=4x+y+z=4x+y+z=4, 2x−y+z=12x-y+z=12x−y+z=1 and 3x+2z=53x+2z=53x+2z=5 are given. Determine whether they have a unique solution.
8 exam-style questions on CCEA A Level Maths 1.1.8 Algebra and functions. Each one has a worked solution and a mark scheme showing where the marks go.