If a line has slope 3 and passes through (0,0), what is y when x = 4?

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Prepare for the 8th Grade FAST Mathematics Test with our Pre-Algebra quiz. Study with multiple choice questions, each with hints and explanations. Build your confidence and ensure you're ready to excel!

Multiple Choice

If a line has slope 3 and passes through (0,0), what is y when x = 4?

Explanation:
A line with slope 3 shows y increases by 3 for every 1 unit x increases. Since it passes through the origin, the intercept is 0, so the equation is y = 3x. When x = 4, y = 3 × 4 = 12. So y equals 12. Values other than 12 would come from a different slope or a nonzero intercept, which isn’t the situation here.

A line with slope 3 shows y increases by 3 for every 1 unit x increases. Since it passes through the origin, the intercept is 0, so the equation is y = 3x. When x = 4, y = 3 × 4 = 12. So y equals 12. Values other than 12 would come from a different slope or a nonzero intercept, which isn’t the situation here.

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