Discussion
If x = +7 and y = -8 then x + 3y is
Answer: C
Substitute \( x = 7 \) and \( y = -8 \), multiplying before adding.
\[ x + 3y = 7 + 3(-8) = 7 - 24 = -17 \]
The 3 multiplies \( y \) only, so it is \( -24 \) that is added, not \( -8 \) - that slip would give \( -1 \).
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