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Question:

If A = [[1, 2], [x, 3]] and B = [[y, x], [1, 1]] such that AB = [[6, 8]], then:

y=2x

y=x

y=-x

y=-2x

Solution:

AB=[68][12x3󔼔]⎡⎢⎣yx1⎤⎥⎦=[68]