He made the first error in number 3
You should subtract left sides and right sides in order to make y disappeared
and you will have the following:
y - y = (x - 6) - (3x - 8) => 0 = x - 6 - 3x - 8 => 0 = -2x - 14 =>
2x = -14 => x = -14/2 = -7
Now you can use -7 in the system and you will get y
y = -7 - 6 = -13
So your answers will be:
x=-7 and y=-13
Step-by-step explanation:
let number be x
5x = 12
12 - 4x = -36
For this case we have that in one hour there are 60 minutes. On the other hand, we have that 1 mile equals 5280 feet.
So, we have:

So, given an amount per foot per minute, we must multiply by
and get miles per hour
ANswer:

Answer:
Step-by-step explanation:
f(x) = 2x^2+ 1
0=2x^2+1
x=4
g(x)= x^2
0=x^2
x^2=0
x=0