Answer:
The slope is 4 and the y-intercept is (0,-2)
Answer: x = 7.2, y = 7.5
<u>Step-by-step explanation:</u>
Similar triangles have the same proportions.
Since ABC ≅ DEF, then 
<u>Let's solve for x:</u>

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<u>Let's solve for y:</u>

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I guess you want the roots of the equation.
We can factor that as
(x-6) * (x + 10)
The roots of the equation are
6 and -10