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In the region 4x+y≤8, x≥0, y≥0, what is the maximum x on the x-axis?

Answer and explanation

Correct answer: 2

On the x-axis, the y-coordinate is zero, so set y=0 in the main inequality. Then 4x+0≤8 gives 4x≤8, and division by positive 4 gives x≤2. The non-negativity condition x≥0 restricts the possible values to 0≤x≤2, so the maximum x-coordinate on the x-axis is 2. It is attained at the boundary point (2,0), which satisfies 4(2)+0=8. Therefore option A is correct. Option B would result from incorrectly using 2x≤8. Option C treats the coefficient 4 as if it were absent. Option D does not reach the x-intercept. The y≥0 condition is automatically satisfied on the x-axis at y=0, while the boundary equation determines the intercept precisely.

Related tags

X-InterceptFeasible RegionLinear InequalitiesGraphical Solution Of Linear Inequalities In Two VariablesMathematicsClass 11 Mcq

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