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If y = -3x + b passes through the point (5, -4), what is b?

Answer and explanation

Correct answer: 11

The governing concept is point substitution in the slope-intercept equation y = mx + b. Every point on a line must satisfy its equation. Substitute x = 5 and y = -4 into y = -3x + b: -4 = -3(5) + b = -15 + b. Add 15 to both sides to isolate the unknown constant: b = -4 + 15 = 11. Therefore, option A is correct. The value b is also the y-intercept because it is the constant term in the equation. Option B can arise from an addition or sign error, option C incorrectly combines the negative terms, and option D fails because -3(5) + 15 equals 0, not -4. Substitution directly verifies the answer.

Related tags

Slope-InterceptPoint-SubstitutionY-InterceptLinear-EquationsSlope And Y InterceptIntroduction To PolynomialsMathematicsClass 9 Mcq

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