Video: Solving Proportional Equations

Given that 8/19 = 4/𝑦, write an expression equal to 8 × 𝑦.

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Video Transcript

Given that eight over 19 is equal to four over 𝑦, write an expression equal to eight times 𝑦.

Since we have one fraction equal to one fraction, we can actually cross-multiply. This is useful because we will be taking eight times 𝑦 and setting it equal to 19 times four. And 19 times four is equal to 76.

Therefore, eight times 𝑦 is equal to 76. So an expression equal to eight times 𝑦 could have been 19 times four or 76.

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