Check If It Is a Straight Line LeetCode solution in C++

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class Solution {
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 public:
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  bool checkStraightLine(vector<vector<int>> &coordinates) {
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    int dx = (coordinates[1][1] - coordinates[0][1]);
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    int dy = (coordinates[1][0] - coordinates[0][0]);
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    for (int i = 2; i < coordinates.size(); i++) {
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      if (dx * (coordinates[i][0] - coordinates[1][0]) !=
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          dy * (coordinates[i][1] - coordinates[1][1]))
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        return false;
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    }
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    return true;
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  }
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};