[Math] Equation of the straight line that passes through the point $(0, 2)$ and has a gradient of $3$

Write down the equation of the straight line that passes through the point $(0, 2)$ and has a gradient of $3$.

I need help in writing the equation. Can you help?

The general equation of a non vertical line is $y=mx+q$ where $m$ is the slope (or gradient) of that line.
If it passes through the point $(0,2)$ then $2=m\cdot 0+q$ which implies that $q=2$. Moroever $m=3$.
Thus your line is $y=3x+2$.