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What are the slope and (y)-intercept of (9x-10y+30=0)?

Answer and explanation

Correct answer: Slope (\frac{9}{10}), (y)-intercept (3)

The direct answer is option A: slope \(\frac{9}{10}\) and y-intercept 3. Put the equation into slope-intercept form. From \(9x-10y+30=0\), subtract the x and constant terms appropriately: \(-10y=-9x-30\). Divide by \(-10\): \(y=\frac{9}{10}x+3\). Comparing with \(y=mx+c\), the slope is \(m=\frac{9}{10}\), while the y-intercept is \(c=3\). Checking directly, at \(x=0\), the original equation gives \(-10y+30=0\), so \(y=3\). Option A matches both values. Option B has both signs reversed. Option C confuses a coefficient with the slope and places \(\frac{9}{10}\) as the intercept. Option D uses unrelated original coefficients and the wrong sign for the intercept. Remember: when dividing by a negative number, both sides change signs; do not lose that sign.

Related tags

General FormFraction SlopeRearrange

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