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If (y=34+8x), what will be the total increase in (y) from (x=1) to (x=6)?

Answer and explanation

Correct answer: (40)

The expression \\(y=34+8x\\) is a linear rule. Its coefficient of \\(x\\), namely 8, tells us that \\(y\\) increases by 8 whenever \\(x\\) increases by 1. We need the total change, not the value of \\(y\\) at just one endpoint. From \\(x=1\\) to \\(x=6\\), the change in \\(x\\) is \\(6-1=5\\).

Multiplying the constant rate by this change gives the increase: \\(8\times5=40\\). Directly, \\(y(1)=34+8=42\\) and \\(y(6)=34+48=82\\), so the difference is \\(82-42=40\\) as well. The constant term 34 cancels when finding a difference. Hence option B, 40, is correct; 48 would incorrectly use the endpoint value of the variable part without accounting for the starting point.

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