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luda_lava [24]
3 years ago
10

Can someone explain #1 and #2 to me? (Picture above) I really need help

Mathematics
1 answer:
Charra [1.4K]3 years ago
5 0
A number can replaced with a variable like x
(X+3)4=16
4x+12=16
4x=4
X=1
(X/4)+3=24
X/4=21
X=84
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5x=4y+8 3y=3x-3 using elimination
suter [353]
Let's rewrite the equation with x and y on the left side of the equal sign.  
5x-4y=8 --------(1) 
3x-3y=3---------(2)  
Divide equation (2) by 3, 
x - y= 1 
now we have, 
5x-4y = 8 --------(1) 
x - y = 1 ---------(2)  
To eliminate x, multiply equation (2) by 5. This makes both the coefficients of x to be 5. Subtract the second equation from the first equation.  
5x - 4y = 8 
(2) * 5 5x - 5y = 5 
(-) (+) (-) 
---------------- 
 0x +y =3
 Therefore, y=3 
 Substitute the value of y, in any one of the two equations. Let's substitute y in the second equation.
 x-3=1
 x=4 
 x=4 and y=3
8 0
4 years ago
There are 3/4 as many boys as girls in a class of fifth graders. If there are 35 students in the class, how many are girls?
OLEGan [10]

Answer:

20 There are 15 boys and 20 girls.

4 0
3 years ago
1,002 divided by 0.499
Zina [86]
Yuh can juss calendar it
7 0
3 years ago
How do you find slope? Example: y=7x-4
mario62 [17]
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Sarah is shopping for groceries at the local supermarket. She paid for her groceries using a $100 bill recently issued by the US
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6 0
3 years ago
Read 2 more answers
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