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Which of the following equations represent linear functions? Select ALL that apply.

***Important Note: In the answer choices below, ^ symbol indicates an exponent. For example, "5^2" means 52, 5 to the 2nd power, or 5 times 5.

Group of answer choices

y = 5x + 7

d = -2t + 3

y = x^2 - 5

y = 4 + x

y = 6^x + 2

y = -x

y = 5