Anybody know how to do algebra?

The solution of a system of equations is the point(s) that lies on both lines. Therefore if the 2 lines cross over each other then there is exactly one solution. If they have no solution it means they are parallel since they don't share a single point and if they are overlapping lines then there is an infinite amount of solutions since they share the same points.

In this case it must have 1 solution.

To find which point is correct you should be able to plug in the same point for the x and y of the equations so that they are valid.

For example in the equation y=2x and y=-1/2x we need to find the point in which will work for both equations. In this case 0,0 is correct (0=0, 0=0)

So lets plug in the points and find the correct solution:

A. -1=-2+5

    -1=-3 - this isn't true since -1 cant possibly equal -3. Therefore this point is incorrect.

B. 3=-2+5

     3=3 - this is valid

    3=-2(-2)-1

      3=4-1

      3=3 - this is also valid

Therefore B is correct

(-2, 3)

Step-by-step explanation:

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

b

step-by-step explanation:

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