State the slope and $y$y-value of the $y$y-intercept of the equation, $y=2x+3$y=2x+3

Line $L_1$L1 has the equation $y=\frac{16x+12}{4}$y=16x+124.

Write the equation of a line which has slope $\frac{2}{3}$23 and goes through the point $\left(0,3\right)$(0,3).

The following is a graph of $y=mx+b$y=mx+b.

Plot the graph if $b$b decreases by $5$5.