SOLUTION: Evaluate when a=2 and b = -3 a. –3a +2b b. b-3b c. –2a(3-b) Solve for x a. x+5= -6 b. –2x+3=15 c. –3(x+2)= -30 d. 7x-4=9x+6 If x=2 and y= -5 in this problem, what is t

Algebra ->  Expressions-with-variables -> SOLUTION: Evaluate when a=2 and b = -3 a. –3a +2b b. b-3b c. –2a(3-b) Solve for x a. x+5= -6 b. –2x+3=15 c. –3(x+2)= -30 d. 7x-4=9x+6 If x=2 and y= -5 in this problem, what is t      Log On


   

Question 171802: Evaluate when a=2 and b = -3
a. –3a +2b
b. b-3b
c. –2a(3-b)
Solve for x
a. x+5= -6
b. –2x+3=15
c. –3(x+2)= -30
d. 7x-4=9x+6
If x=2 and y= -5 in this problem, what is the value of the following expressions after you substitute
2x+5y-4=
4y+3x-2xy=
True or False?
a. 4^3+4^5=4^8
b. (-5)^3= -5^3
I need help with these. and I think I will be able to figure out the rest of my hw. Thank you very much for anyone who can help me!
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
I'll one of each to help you get started


Problem: Evaluate when a=2 and b = -3

a. –3a +2b

Solution:

-3a%2B2b Start with the given expression


-3%282%29%2B2%28-3%29 Plug in a=2 and b = -3


-6%2B2%28-3%29 Multiply -3 and 2 to get -6


-6-6 Multiply 2 and -2 to get -6


-12 Subtract -6 from -6 to get -12


So -3a%2B2b=-12 when a=2 and b = -3






Problem: Solve for x

d. 7x-4=9x+6


Solution:


7x-4=9x%2B6 Start with the given equation.


7x=9x%2B6%2B4 Add 4 to both sides.


7x-9x=6%2B4 Subtract 9x from both sides.


-2x=6%2B4 Combine like terms on the left side.


-2x=10 Combine like terms on the right side.


x=%2810%29%2F%28-2%29 Divide both sides by -2 to isolate x.


x=-5 Reduce.


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Answer:

So the answer is x=-5



Problem: If x=2 and y= -5 in this problem, what is the value of the following expressions after you substitute


2x+5y-4=


Solution:

2x%2B5y-4 Start with the given expression


2%282%29%2B5%28-5%29-4 Plug in x=2 and y= -5


4%2B5%28-5%29-4 Multiply 2 and 2 to get 4


4-25-4 Multiply 5 and -5 to get -25


4-29 Subtract -4 from -25 to get -29


-25 Subtract 29 from 4 to get -25


So 2x%2B5y-4=-25 when x=2 and y= -5





Problem: True or False?

b. (-5)^3= -5^3

Solution:

%28-5%29%5E3=+-5%5E3 Start with the given equation


-125=+-5%5E3 Cube -5 to get %28-5%29%5E3=%28-5%29%28-5%29%28-5%29=25%28-5%29=-125


-125=+-125 Cube 5 to get 5%5E3=%285%29%285%29%285%29=25%285%29=125


Since both sides are equal to one another, this shows us that %28-5%29%5E3=+-5%5E3. So the answer is true.