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soldier1979 [14.2K]
3 years ago
8

7x-5y=4; what does x and y equal

Mathematics
1 answer:
kondor19780726 [428]3 years ago
8 0
To solve for x:

7x - 5y = 4   Add 5y to both sides
       7x = 5y + 4   Divide both sides by 7
         x = \frac{5}{7}y + \frac{4}{7}
                 or
         x = \frac{5y + 4}{7}

To solve for y:

7x - 5y = 4   Subtract 7x from both sides
      -5y = -7x + 4   Divide both sides by -5
         y = \frac{7}{5}x - \frac{4}{5}
                or
         y = \frac{7x - 4}{5}
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DanielleElmas [232]

Answer:

18 pencils

Step-by-step explanation:

1/2 dozen:6

1 dozen:12

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3 years ago
Find the measure of ∠EGC. Circle A with chords EF and CD that intersect at point G, the measure of arc EC is 50 degrees, the mea
miv72 [106K]

Answer:

m∠EGC=70°

Step-by-step explanation:

we know that

The measure of the inner angle is the semi-sum of the arcs comprising it and its opposite

so

m∠EGC=(1/2)[arc EC+arc DF]

<u><em>Find the value of x</em></u>

we have

m∠EGC=(7x+7)°

arc EC=50°

arc DF=10x°

substitute and solve for x

(7x+7)°=(1/2)[50°+10x°]

14x+14=50+10x

14x-10x=50-14

4x=36

x=9

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m∠EGC=(7x+7)°

substitute the value of x

m∠EGC=(7(9)+7)°=70°

8 0
4 years ago
Read 2 more answers
Which is the value of this expression when a=5 and k=-2?<br>[3^2a^-2]^k<br>[3a^-1]<br>​
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Step-by-step explanation:

((32)(5−2))−2(3(5−1))

((32)(5−2))−2(3(5−1))

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(18x 5 + 6x 4 - 12x 3) ÷ 6x 2
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3 years ago
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How to simplify each expression<br> 2/3(7w + 4) - 1/3 (2w - 1 )<br><br> (3-7m) +2(3.5m+ 1)
rewona [7]
  14 w /3  + 8/3  - ( 2/3w  -1/3 )   =  
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the second 
 3-7m +7m+ 2 = 5 





3 0
3 years ago
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