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fenix001 [56]
3 years ago
15

How do I solve for 7y-4x=42 x=5y+9

Mathematics
1 answer:
8_murik_8 [283]3 years ago
8 0

Answer:

x=-21  y=-6

Step-by-step explanation:

7y-4(5y+9)=42

7y-20y-36=42

-13y=78

y=-6

x=5*(-6)+9

x=-30+9

x=-21

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Seven and thirty twp hundreths plus two and one tenth times two and seven tenths minus 18a
alexdok [17]
Answer:  Write the expression as:

" 70 \frac{32}{100} +
                         2\frac{1}{10} * 2\frac{7}{10 − 18a " ; 
______________________________________________________
or;  write as:
______________________________________________________
           " 70.32  + (2.1) * (2.7)  − 18a " ; 
______________________________________________________

To simplify:
______________________________________________________

  Using "PEDMAS" (the "order of operations") ; 

the "multiplication" comes first; 

So:  →  "(2.1) * (2.7) =  5.67 " .

And rewrite:
______________________________________________________
 " 70.32  + 5.67 − 18a " .

Now:  " 70.32 + 5.67 = 75.99 " ; 

So, we can the final simplified expression as:
______________________________________________________
   " 75.99  −  18a " ;  

or; write as:  " 75\frac{99}{100}  −  18a " .
______________________________________________________
7 0
3 years ago
Please help mee <br><br> help help
Damm [24]

Answer:

So, to 1 d.p. 7 is about 23% out of 30. (7 of 30=23%)

Step-by-step explanation:

7/30 x 100 =23.3333333333% or 70/3%.

6 0
2 years ago
Rewrite the following without an exponent.<br> (-5)-2 (the -2 is the exponent)
yuradex [85]

Answer: -5 x -5

The exponent two means the other number multiplied 2 times, so the equation is -5 x -5. The answer to the equation is -25.

Hope this helped you out!

3 0
2 years ago
Help me please it would help
Alex73 [517]

Answer:

2.) 11(17/21)

3.) -18(3/5)

4.) -28

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6 0
2 years ago
Read 2 more answers
HELP PLEASE:
ss7ja [257]
D.$6,270 you just multiple
8 0
3 years ago
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