We are given the measures of two angles in the form of linear equations. According to the graph, the measure of both angles is 90°. therefore, we can establish an equation and find the variable "p", from there we can replace that variable in the equation for the required angle.
The sum of the angles is:

we add like terms, like this

substracting 46 on both sides we get

Dividing each side by 11

Now that we have the value for "p" we can replace it in the equation for angle PTH, like this


Therefore angle PTH is 46