Compute $\frac{\Delta y}{\Delta x}$ using the two points to get the slope $m$.

Plug one of the points into $y=mx+b$ to find $b$.

In Desmos, type the points A=(-1,3) and B=(2,9).

Type m=(9-3)/(2-(-1)) and note the value Desmos gives for $m$.

Type b=3-m*(-1) (or use the other point with b=9-m*2) to get $b$.

Form the equation y=mx+b and compare it to the four answer choices to select the matching equation.

From the graph, line $t$ passes through $(-1,3)$ and $(2,9)$. The slope is

Use $y=mx+b$ with $(-1,3)$:

With $m=2$ and $b=5$, the equation of the line is $y=2x+5$.