Anybody good at math?

1) 2x + 8y = 20
y=2​

Answers

Answer 1
Answer:

Answer:

2x+8y=20;y=2  

Solution :

{x,y} = {2,2}  

 

System of Linear Equations entered :

  [1]    2x + 8y = 20

  [2]    y = 2

Graphic Representation of the Equations :

   8y + 2x = 20        y = 2  

 

 

Solve by Substitution :

// Solve equation [2] for the variable  y  

  [2]    y = 2  

// Plug this in for variable  y  in equation [1]

  [1]    2x + 8•(2) = 20

  [1]    2x = 4

// Solve equation [1] for the variable  x  

  [1]    2x = 4  

  [1]    x = 2  

// By now we know this much :

   x = 2

   y = 2

We are done

Solution :

{x,y} = {2,2}

Step-by-step explanation:

Answer 2
Answer:

Answer:

Step-by-step explanation:


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A small grill can hold two hamburgers at a time. If it takes 5 minutes to cook one side of a hamburger, what is the shortest time needed to cook both sides of five hamburgers?

Answers

If you were to grill two hamburgers at the same it would take 5 minutes to grill one side of 2 hamburgers and ten minutes to grill 2 ham burgers on both sides. So 10 minutes would make two hamburgers while 20 minutes will cook 4 hamburgers than add and extra 10 minutes to cook the last hamburger on both sides.
10 minutes = 2 both side cooked hamburgers

10 minutes = 2 both side cooked hamburgers

an extra 10 minutes = another both side cooked hamburgers since we only need five
=
30 minutes in minimal time to cook five hamburgers

Given: x + 2y = -6.

Solve for y.

Answers

x + 2y =-6

Subtract x on both sides

x + 2y-x =-6-x

2y =-6-x

Divide by 2 on both sides

(2y)/(2) =(-x-6)/(2)\n\ny =(-x-6)/(2)\n\n \boxed{\bf{y=-(1)/(2)x -3}}

What is (-m)^-3n, if m= 2 and n= -24?a. 3b. -3c. 4. d. -4

Answers

(-m)^(-3)n\n\nm=2;\ n=-24\n\nsubtitute\n\n(-2)^(-3)\cdot(-24)=(1)/((-2)^3)\cdot(-24)=(1)/(-8)\cdot(-24)=(-24)/(-8)=3

Answer: a. 3

What is the axis of symmsymmiof y=2(x+1)^2

Answers

y=a(x-h)^2+k
axis of symmetry is x=h

given
y=2(x-(-1)^2+0
h=-1
axis of symmetry is x=-1

3/8 +1/5 equals what it is on my homework and I'm struggling

Answers

make bottom numbers same
they should be 40
to kee p fractions the same multiply topo and bottom by same number
3/8 times 5/5=15/40
1/5 times 8/8=8/40
15/40+8/40=23/40
23/40
*You might beable to simplify it

3. a. Simplify (2x + y) (x-7)
b. Find the truth set of 2x-3 +3 = -1

Answers

Answer: b. X=-1/2

Step-by-step explanation:

2x-3+3=-1-3 and +3 cancel each other

2x=-1 both sides divided by 2

X=-1/2