The intercept on the y axis is -3. Find the values of A, B and C. 。

Two-point substitution equation

0=a-b+c

0=9a+3b+c

The intercept on the y axis is -3.

Y=-3 when x = 0.

-3=c

Substitute into the previous equation.

0=a-b-3

0=9a+3b-3

Then a= 1 b=-2.

∴ a= 1 b=-2 c=-3