Answer:

x = 12
Step-by-step explanation:
The slope-intercept form formula,
, can be used to write an equation for the line.
Where,
m = slope = 
b = y-intercept, which is the point at which the line intercepts the y-axis. At this point, x = 0.
Let's find the slope (m) using the coordinates of the two points given, (0, 30), (3, 60).

Let,





y-intercept of the line, b = 30
Equation for the line would be:

Using the equation, find x when y = 150.
Simply substitute the value for y in the equation to find x.

Subtract 30 from both sides


Divide both sides by 10


x = 12