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Explanation:
if x = -2, just substitute to the equation
y = 15 - 3x
y = 15 - 3 (-2)
y = 15 + 6
y = 21
if x = -1, then
y = 15 - 3 (-1)
y = 15 + 3
y = 18
if x = 3, then
y = 15 - 3 × 3
y = 15 - 9
y = 6