- #1
Ryker
- 1,086
- 2
Homework Statement
Suppose you have points of a specific form, say (x, y, 3x + 2y). Show that this set of points is a solution to a homogeneous system of linear equations, hence a subspace.
The Attempt at a Solution
I'm wondering how one is able to go about this. Here's my try, but I'm not sure I'm going about this the right way. I assumed vectors u = (x1, y1, 3x1 + 2y1) and v = (x2, y2, 3x2 + 2y2) are two solutions. Next, I said any linear combination of them, say, tu + sv is also a solution to Ax = 0, where x is the solution vector. Then I just expanded the terms and showed that indeed any solution to Ax = 0 as a linear combination of u and v still retains the form (x, y, 3x + 2y).
Is this the proper way of doing this or is there another one? Should I have perhaps instead written down, for example, a1x + a2y + a3(3x + 2y) = 0, expanded it to (a1 + 3a3)x + (a2+2a3)y = 0, and then resolved this equation to show that the solutions for a's involve parameters?