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In 10y − 9x = 60, what are the value of y at x = 0 and the slope?

Answer and explanation

Correct answer: y = 6, slope 9/10

The governing concept is the slope-intercept form y = mx + b. Rearrange 10y - 9x = 60 by adding 9x to both sides: 10y = 9x + 60. Dividing by 10 gives y = (9/10)x + 6. Therefore the slope is m = 9/10 and the y-intercept is b = 6. At x = 0, the equation gives y = (9/10)(0) + 6 = 6, so option A is correct. Option B changes signs without justification. Option C mistakes the constant 60 for the intercept, and option D reads the original coefficients directly instead of first isolating y. The positive slope also agrees with the fact that y increases as x increases.

Related tags

SlopeY-InterceptLinear-EquationRearrangementSlope Intercept FormLinear Equations In Two VariablesMathematicsClass 9 Mcq

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