We learned function this week.

For example, determine the value of the y-intercept of the graph of each equation.

2y+3x-12=0, y-int=(0,y), 2y-12=0, -12=2y, 6=y.

For example, f(x)=5-3x, what is f(1)? x=1, So we can substitute that in. 5-3(1)=2. So the answer is 2.

Solve for a if h(3)=8 and h(x)=3×2-ax-1. We can know x=3. 3×2-ax-1=8, because h(3)=8. then 27-3a-1=8, 3a=8+1-27=-18, a=-18/-3, a=6.