Find the Image 2x-3y=0 given matrix transformation \(T = \left[ \begin{matrix}

iocasq4

iocasq4

Answered question

2022-01-29

Find the Image 2x3y=0 given matrix transformation
T=[5241]

Answer & Explanation

sainareon2

sainareon2

Beginner2022-01-30Added 10 answers

Step 1 
The line 2x3y=0 defines a subspace. This line is orthogonal to the vector r that you employed. The proper perspective is to consider the line as a set of all
(x,y)R2 such that (x,y)=(x,23x) since y=23x 
So it suffices to check where T sends, say (3,2) (which is on the line). Hence, computing 
(5241)[32] 
should give the answer.

Nevaeh Jensen

Nevaeh Jensen

Beginner2022-01-31Added 14 answers

Step 1
Realize that
{x,y:2x+3y=0}
is a subspace.
Step 2
find the basis for the subspace. It is
(1, 23)
Step 3
Do matrix multiplication.
[5241][123]=[193143]
Step 4
Translate back into equation form.
P1=α[19343]
and
P2=β[19343]
Plug these two points (interpreting the top entries as x coordinate and bottom entries as y-coordinate). Use the point-slope equation
y=y2y1x2x1x

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