AzizHusain

Note that 16 does not equal -4 so you cannot add 4 to both sides to get 20...

A linear equation is something that produces a line on a graph found in the format y = mx + b with m as the slope, b as the y-intercept (when x = 0), and x & y as the points on the graph.

A simple linear equation is y = x. Note, that this is basically a line passing through the origin (0,0) and is diagonal. Since y =x, we get a line with a slope of 1.

Think of 6.25 as 625/100.

Now, simplify as much as possible.

That's it. 

1.47 m/s is about the average rate people walk.

Ahh, I have no idea why I did that...I guess I was trying to find a different way with 100s.

I think I'm going crazy. :p

You can find an equivalent expression by distributing the 20 and -4.

20x - 20y - 4x - 4y.

Collect like terms:

20x - 4x - 20y - 4y.

16x - 24y.

Simply plug in 20 for n and solve.

Let's set up an equation after defining some variables:

L = length & W = width

L = W + 10 (length is 10 more feet than the width)

Perimeter of a rectangle is 2L + 2W...

2(W + 10) + 2W = 44.

Distribute the 2.

2W + 20 + 2W = 44.

Combine like terms and subtract 20 from both sides.

4W = 24.

Solve for W.

W = 24/4 = 6.

So, L = W + 10 = 6 + 10 = 16.

L = 16 ft.

W = 6 ft.

Check: 2L + 2W = 44. 

2(16) + 2(6) = 44.

32 + 12 = 44. Yes.

Note, your answer will be negative and you need to find a common denominator. In this case, it is easiest to multiply 2 and 49 to get a common denominator of 98.

Since both denominators are 98, you need to multiply 7 by 49 and -4 by 2.

Now, just add the two negatives!

Type in acos in the calculator or you can first press the "2nd" key and then select "acos."