Straight Lines
ICSE · Class 11 · Mathematics
Most important questions from Straight Lines for ICSE Class 11 Mathematics board exam 2026. MCQs, short answer, and long answer questions with marks.
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Slope of line 2x − 3y + 6 = 0 is:
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2/3
Slope = −a/b = −2/(−3) = 2/3.
Slope of a line perpendicular to slope 3 is:
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−1/3
Perpendicular slope = −1/m = −1/3.
Equation of line with slope 2 and y-intercept 5:
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y = 2x + 5
Slope-intercept form: y = mx + c = 2x + 5.
Two parallel lines have slopes that are:
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Equal
Parallel lines: m₁ = m₂.
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