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ZX-51C10F66D32026年6月国际D卷练习 · 第 18 题
2026年6月国际D卷练习 · 原库模块 1 · Q18 参考答案
Line p is defined by the equation \( y=\frac{7}{5}x-\frac{49}{5} \) and line r is defined by the equation \( ax+by=1 \), where a and b are constants. In the xy-plane, line r is perpendicular to line p and passes through the point (12, 7). What is the value of b?
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