All categories

3 years ago

I need help i under stand the adding version just not subtraction

2 answers:

7 0

---------------------------------
Define x and y :
---------------------------------
Let x be the number of large boxes.
Let y be the number of smaller boxes.

---------------------------------
Construct equations :
---------------------------------
x + y = 125 -------------------------- (1)
50x + 30y = 4850 ---------------- (2)

---------------------------------
From equation (1) :
---------------------------------
x + y = 125
x = 125 - y

---------------------------------
Substitute x = 125 - y into (2) :
---------------------------------
50 (125 - y) + 30y = 4850
6250 - 50y + 30y = 4850
20y = 1400
y = 1400 ÷ 20
y = 70

---------------------------------
Sub y = 70 into equation 1
---------------------------------
x + y = 125
x + 70 = 125
x = 55

---------------------------------
Find the number of boxes :
---------------------------------
Large box = x = 55
Small box = y = 70

---------------------------------------------------------------------------------------------------
Answer: There are 55 large boxes and 70 small boxes.
---------------------------------------------------------------------------------------------------

monitta3 years ago

4 0

Let L and S represent the numbers of Large and Small boxes, respectively.
.. L + S = 125 . . . . . . . . . . there are 125 boxes in all
.. 50L + 30S = 4850 . . . . . total weight of all boxes is 4850 pounds

You can multiply the first equation by -30 and add that to the second.
.. -30L -30S = -3750
Adding this to the second equation, we get
.. (-30L +50L) +(-30S +30S) = (-3750 +4850)
.. 20L = 1100
.. L = 55

and from the first equation ...
.. 55 + S = 125
.. S = 70

The truck is carrying
.. 55 large boxes
.. 70 small boxes

_____
Subtraction and addition are basically the same thing. You just need to pay attention to the sign of the number.

You might be interested in

What is the equation for the line?

Irina-Kira [14]

In order to find the equation of a line, you would have to use the equation y=mx+b.

First, find the slope: $\frac{y_{2}- y_{1} }{x_{2} x_{1} }$
There is (1,8) and (2, 16) so plug that in 16-8/2-1 = 8. That's your slope! (Or the m)

Next in order to find b, you have to plug in a point:
y=8x+b
Take (1,8) and plug it in for x and y:
8=8(1)+b
b=0
Your y intercept is 0 (which you can also see on the graph)

So your answer is: y=8x

7 0

3 years ago

If you need a array of 26 what two number multiplyed equal 26

Goryan [66]

The answer is 13 times 2

7 0

3 years ago

Read 2 more answers

Which is the value of g(-5) if g(x)=3.4x-8?

irinina [24]

Plug the value -5 in. (3.4)(-5) - 8 is equivalent to -17 - 8. Final answer: g(-5) = -25.

6 0

3 years ago

If alvin sold 60% of his baseball cards, gave away 30% of those that were left, and still had 40 baseball cards in his possessio

kipiarov [429]

Answer:

The number of baseball card to begin with is 143

Step-by-step explanation:

Let The number of baseball cards = x

The number of sold baseball card = 60% of x

= 0.6 x

The number of left baseball card = x - 0.6 x = 0.4 x

The number of card gave away = 30 % of left cards

= 0.3 × 0.4 x = 0.12 x

The number of card left in his possession = 40

So, 0.6 x + 0.12 x + 40 = x

Or, 40 = x - 0.6 x - 0.12 x

Or, 40 = 0.28 x

∴ x = $\frac{40}{0.28}$ = 142.85 ≈ 143

Hence The number of baseball card to begin with is 143 Answer

3 0

3 years ago

The cost (C) for P pounds of apples can be represented by the equation c=4p. Graph the proportional relationship between the num

AlladinOne [14]

Hi how was you day hope it was good mine was good bye

6 0

3 years ago