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Axes are turned 45° counterclockwise. The line y = x becomes
Ax' = 0
By' = 0
Cy' = x'
Dx' + y' = 0
Answer & Solution
Correct answer: B. y' = 0
y' = -x sin45° + y cos45° is zero when y = x, so the line coincides with the new x' axis.
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