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What is the x intercept?

David Jia
Math Tutor
David Jia is an Academic Tutor and the Founder of LA Math Tutoring, a private tutoring company based in Los Angeles, California. With over 10 years of teaching experience, David works with students of all ages and grades in various subjects, as well as college admissions counseling and test preparation for the SAT, ACT, ISEE, and more. After attaining a perfect 800 math score and a 690 English score on the SAT, David was awarded the Dickinson Scholarship from the University of Miami, where he graduated with a Bachelor’s degree in Business Administration. Additionally, David has worked as an instructor for online videos for textbook companies such as Larson Texts, Big Ideas Learning, and Big Ideas Math.

David Jia

Math Tutor

Expert Answer

The x intercept is wherever the line or the graph crosses the horizontal x axis.

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Question

How do you find the x intercept with a line equation?

David Jia
Math Tutor
David Jia is an Academic Tutor and the Founder of LA Math Tutoring, a private tutoring company based in Los Angeles, California. With over 10 years of teaching experience, David works with students of all ages and grades in various subjects, as well as college admissions counseling and test preparation for the SAT, ACT, ISEE, and more. After attaining a perfect 800 math score and a 690 English score on the SAT, David was awarded the Dickinson Scholarship from the University of Miami, where he graduated with a Bachelor’s degree in Business Administration. Additionally, David has worked as an instructor for online videos for textbook companies such as Larson Texts, Big Ideas Learning, and Big Ideas Math.

David Jia

Math Tutor

Expert Answer

If you just have a simple equation like y=mx+b, you would find the x-intercept by substituting 0 for y and solving for x. If it's a quadratic equation, you'd solve by either factoring or using the quadratic equation.

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What if the square root isnt perfect?

Donagan

Top Answerer

If you mean the square root is not a whole number, that's OK. It just means that the x-intercept will occur somewhere between two integers on the x-axis.

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Question

What is the x-intercept of the equation 2x-y=8?

Community Answer

To find the x-intercept, set every other variable to 0, and solve for x. If 2x - 0 = 8, then 2x/2 = 8/2, and x = 4. So 4 is the x-intercept of that equation.

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What is the value of y in the equation y = 2x + 1?

Donagan

Top Answerer

In order to find a numerical value for y, you would have to know the numerical value of x, then double it and add 1. Otherwise, "2x + 1" is the only value y can have.

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The graph of y=10x2+bx+c has the x intercept at 1.4 and 1.5. What is c-b?

Community Answer

Remember that x-intercepts are roots (or zeros) of an equation, and that roots are factors. Then y = a(x-1.4)(x-1.5), where a must be 10 in order to have the leading coefficient of 10x^2. Now that you know y = 10(x-1.4)(x-1.5), just multiply it out and see what a and b are. y = 10x^2 -29x + 21. So b = -29, c = 21, and c-b = 50.

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