First, move the (-2x) to the right side.
-y = 5 + 2x
Then multiply everything by negative one.
y= -2x - 5
Answer:
Option 1:
He starts with $10, and for each week, we add $100
Then his balance as a function of weeks will be:
f(w) = $10 + $100*w
option 2.
Again, we start with $10, and for each week that passes this is doubled, then the equation will be:
g(w) = $10*(2)^w
Now, we want in week w = 7 to have at least $700, then we need to replace w by 7 in both equations and see which one is better.
option 1:
f(7) = $10 + $100*7 = $710
With option 1 he will have enough
option 2:
g(7) = $10*(2)^7 = $1280
Again, he will have more than $700 in week 7, and we can clearly see that this option is better.
She should have added 2 to both sides of the equation instead of subtracting 2.
2x -2 = 14
Add 2 to both sides:
2x = 16
Divide both sides by 2:
x = 8
<span> 5x = 99 -14y
15x = -39+14y
----------------------add
20x = 60
x = 3
5(3) = 99 - 14y
15 = 99 - 14y
14y = 84
y = 6
answer
x = 3, y = 6</span>