Three points have coordinates A(7, 4), B(19, 8) and C(k, 2k). Find the value of the constant

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Three points have coordinates A(7, 4), B(19, 8) and C(k, 2k).
Find the value of the constant k for which:
a. C lies on the line that passes through the points A and B
b. angle CAB is 90°.

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