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Step-by-step explanation:
(x, y) =
(3, $390)
(5, $620)
y = ax + b
390 = 3a + b
620 = 5a + b
2. equation minus 1. equation
230 = 2a
a = 115
390 = 3×115 + b = 345 + b
45 = b
y = 115x + 45