Question 421878
the equation is y = ax^2 + bx + c


the y intercept is the value of y when the value of x is 0.


when the value of x is 0, this equation becomes y = a*0 + b*0 + c which becomes y = c


there is only 1 value of c that can satisfy this equation, and that is the value of c that is given at the start of the equation.


example:


y = 20x^2 + 30x + 15


when x = 0, this becomes y = 20*0 + 30*0 + 15 which reduces to y = 15.