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enot [183]
3 years ago
13

The value of 2x + 2y, for x = 7 and y = 3, is 50. True False

Mathematics
2 answers:
Lilit [14]3 years ago
5 0
2x+2y =50
2(7)+ 2(3)=50
14+6 =50
20=/=50

This is false because when you substitute the variables with their numbers and then multiply and add, your answer does not equal 50
lina2011 [118]3 years ago
5 0
Well we just have to plug in x for 7 and y for 3 
given our equation..
2x + 2y = 50
when x = 7 
and y = 3 

2(7) + 2(3) = 50 

Now we know that 2 x 7 = 14 
and that 2 x 3 = 6 
Now plug those in 

14 + 6 = 50
now 14 + 6 = 20 
20 = 50? 
NOPE 20 does not equal 50 

So your answer is FALSE. 

Hope you have a lovely day :)
love, the Pineapple <3
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4.9t+0.3=5.6t+0.72 I need help on my work lol
Whitepunk [10]

The first step that we must take before attempting to solve the problem is to understand what the problem is asking us to do and what is given to us to help accomplish that goal.  Although it does not explicitly state that we must solve for t, this is usually what the problem statement would be asking if we just receive and expression like this.  What is given to us to accomplish that goal is the expression 4.9t+0.3=5.6t+0.72.

Now that we have completed that step, we can move onto the next part which is actually solving the problem.  The next step that we should take when solving for the unknown, in this case t, is to subtract 4.9t from both sides.

<u>Subtract 4.9t from both sides</u>

  • 4.9t+0.3=5.6t+0.72
  • (4.9t-4.9t)+0.3=(5.6t-4.9t)+0.72
  • 0.3=(5.6t-4.9t)+0.72
  • 0.3=(0.7t)+0.72

Now that we got all of the t's to one side, let us isolate t completely and the next step that we should take is to subtract 0.72 from both sides.

<u>Subtract 0.72 from both sides</u>

  • 0.3=0.7t+0.72
  • 0.3 - 0.72=0.7t+0.72 - 0.72
  • 0.3 - 0.72=0.7t
  • -0.42=0.7t

The final step that we need to take to isolate t would be to divide both sides by 0.7 which would remove the coefficient from the unknown variable t and divide 0.7 from -0.42

<u>Divide both sides by 0.7</u>

  • -0.42=0.7t
  • \frac{-0.42}{0.7}=\frac{0.7t}{0.7}
  • \frac{-0.42}{0.7}=t
  • -0.6=t

Therefore, after fully narrowing down the solution we were able to determine that the solution of the unknown variable or t is equal to -0.6

5 0
2 years ago
The endpoint of a line segment is (-9, 7). The midpoint of the segment is (10, -3). Find the other endpoint. *show work*
slavikrds [6]
First we will find the x coordinate.

x1+x2 / 2 = the x coordinate of the midpoint.

-9 + x2 / 2 = 10
x2/2 -4.5 = 10
x2/2 = 14.5
x2 = 29

Now the y coordinate:

y1+y2 /2 = y coordinate of the midpoint

7 + y2 / 2 = -3
y2/2 + 3.5 = -3
y2/2 = -6.5
y2 = -13

So the other endpoint is (29,-13)

I hope i am right :)

8 0
3 years ago
Given the formula y = mx + b, what is the slope of a line, m, if x = 5, y = 7, and b =10?
anygoal [31]
The answer is:
C. The slope -3/5
Because -3/5 times 5 is -3 and when you combine -3 and 10 the answer is 7 and 7=7 (the y)
3 0
3 years ago
You have $270 in your bank account. You plan to save $80 from your paycheck each week. Which graph shows your bank account balan
elixir [45]
Y=80x+270
If you want to know how to do it just let me know
7 0
3 years ago
Read 2 more answers
Which of the following methods of timekeeping is the least precise?
Westkost [7]
It’s c counting your heartbeats
8 0
3 years ago
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