Q. Find the x-Intercept of the Line \( 12x + 11y = 8 \)

Answer

  1. Set y to 0.

    \[ 12x + 11(0) = 8 \]

  2. Solve for x.

    \[ 12x = 8 \]

    \[ x = \frac{8}{12} \]

  3. Simplify the fraction.

    \[ x = \frac{2}{3} \]

    The x-intercept is (2/3, 0).

Detailed Explanation

Step 1 — Understand what the x‑intercept is. The x‑intercept is the point where the graph crosses the x‑axis. At any point on the x‑axis, the y‑coordinate equals 0. Therefore to find the x‑intercept, set y equal to 0 in the equation of the line.

Step 2 — Substitute y = 0 into the equation. Start with the given line: \(12x + 11y = 8\). Replace y with 0 to obtain:

\(12x + 11(0) = 8\)

Step 3 — Simplify the equation after substitution. Compute 11(0) = 0, so the equation becomes:

\(12x + 0 = 8\)

which simplifies to

\(12x = 8\)

Step 4 — Solve for x. Divide both sides of the equation by 12 to isolate x:

\(x = \dfrac{8}{12}\)

Step 5 — Simplify the fraction. The greatest common divisor of 8 and 12 is 4. Divide numerator and denominator by 4:

\(x = \dfrac{8 \div 4}{12 \div 4} = \dfrac{2}{3}\)

Conclusion — x‑intercept as a point. The x‑intercept is the point with x = \(\tfrac{2}{3}\) and y = 0, i.e.

\(\left(\dfrac{2}{3},\,0\right)\)

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Frequently Asked Questions

What is the x-intercept of 12x + 11y = 8?

Set y = 0: 12x = 8, so x = 8/12 = 2/3. The x-intercept is (2/3, 0).

Why do you set y = 0 to find the x-intercept?

The x-intercept is the point where the graph crosses the x-axis; all points on the x-axis have y = 0, so set y to zero and solve for x.

How can I check the x-intercept is correct?

Substitute (2/3, 0) into 12x + 11y = 8: 12(2/3) + 11(0) = 8, which simplifies to 8 = 8, so it's correct.

What is the y-intercept of the same line?

Set x = 0: 11y = 8, so y = 8/11. The y-intercept is (0, 8/11).

What is the slope of the line 12x + 11y = 8?

Rearrange to y = (-12/11)x + 8/11, so the slope is -12/11.

How do I graph this line quickly using intercepts?

Plot the intercepts (2/3, 0) and (0, 8/11) and draw the line through them; two points uniquely determine the line.

Could line have no x-intercept?

Yes: horizontal line y = c with c ≠ 0 never crosses the x-axis, so it has no x-intercept. Vertical lines x = k always have an x-intercept at (k, 0).

How do I convert 8/12 to simplest form or decimal?

Simplify 8/12 by dividing numerator and denominator by 4 to get 2/3. As decimal, 2/3 ≈ 0.6667.
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