How do I know when a quadratic function crosses the y-axis?

The key thing to remember here is that the y-axis is a straight line and all of the points that lie on it have the x-value of 0. This means that the curve crosses the y-axis when x=0 so you can substitute this into the function to calculate the y value.For example, if y = x2 + 6x + 8, we would substitute x with 0 to calculate y.y = x2 + 6x + 8y = 02 + 6(0) + 8y = 0 + 0 + 8 = 8Therefore the function crosses the y-axis when x is 0 and y is 8, the co-ordinate (0,8).

Answered by Scott R. Maths tutor

4078 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Work out 7/8 × 3/4


How do I know wether to use the sine or cosine rule?


Solve the equation to find the value of t. (5t+3)/4=1


Factorise 3xy+6x^2


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2024

Terms & Conditions|Privacy Policy
Cookie Preferences