Select all ratios equivalent to 2:7.
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How to tell: a ratio x:y is equivalent to 2:7 exactly when x/y = 2/7, equivalently 2·y = 7·x. So test each choice by cross-multiplying.
Examples of equivalent ratios: 4:14, 6:21, 8:28, 10:35, 12:42, 20:70 (and generally 2k:7k for any nonzero k). Negative equivalents: -2:-7. Nonexamples: 0:7, 3:7, 5:18, etc.
Paste the choices and I’ll mark which ones are equivalent.
How to tell: a ratio x:y is equivalent to 2:7 exactly when x/y = 2/7, equivalently 2·y = 7·x. So test each choice by cross-multiplying.
Examples of equivalent ratios: 4:14, 6:21, 8:28, 10:35, 12:42, 20:70 (and generally 2k:7k for any nonzero k). Negative equivalents: -2:-7. Nonexamples: 0:7, 3:7, 5:18, etc.
Paste the choices and I’ll mark which ones are equivalent.
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