Hi there!
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Simplifying

Reorder the terms:

Solving

Solving for variable 'Y'.
Move all terms containing Y to the left, all other terms to the right.
Simplifying

Hope this helped you!
This is why the internet was invented so lets use an online math calculator.
Prime means that the only factors are 1 and itself.
Woah look at what I found!
263 is prime
1057 isn't? oh wow. 7 * 151
3163 is prime
157 is prime
So it is 1057 oh wow
Answer:

Step-by-step explanation:
Tangent to y-axis means that the side of the circle TOUCHES the y axis.
Since the center is at (-7,2) and it touches the y axis, we can figure out the radius. It goes from (-7,2) to y-axis. Horizontally, the center is 7 units left of y-axis, so that is the radius ----- 7 units
The standard form of a circle is:

Where
(h,k) is the center
r is the radius
Putting the information into the form, we have:

THis is the standard form.
The line touching the point (0,3) goes to the equation y= 2x + 3 because + 3 represents the y-intercept. The line touching (0,-2) goes to the equation y = 2x - 2 because - 2 represents the y-intercept as well.