The slope-intercept form:

m - slope
b - y-intercept
We have the slope 
and point (9, 7). Substitute:

<em>subtract 3 from both sides</em>

Answer: 
Answer:
x = 12
Step-by-step explanation:
The figure in the question was split into the triangles in the attachment to the solution.
Now applying the principle of similar triangles, we have:

cross-multiplying, we have:

solving for x,
x = 12
Answer:
1500
Step-by-step explanation:
2500/5=500,*3=1500
Answer:
x=-b/2a
Step-by-step explanation:
hope that helps :)
mark as brainliest please :)