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antoniya [11.8K]
2 years ago
9

Given 2x - 9y - 12 = 0, express 5x - 4y + 7 = 0 in terms of x only

Mathematics
1 answer:
olga2289 [7]2 years ago
5 0

Answer:

4 \frac{1}{9}x + 12\frac{1}{3} = 0

Step-by-step explanation:

Based on 2x - 9y - 12 = 0

-9y = 12 - 2x

9y = -12 + 2x

y = -1\frac{1}{3} + \frac{2}{9} x

Therefore...

5x - 4y + 7 = 0

5x - 4(-1\frac{1}{3} + \frac{2}{9} x) + 7 = 0

5x + 5\frac{1}{3}  - \frac{8}{9} x + 7 = 0

4 \frac{1}{9}x + 12\frac{1}{3} = 0

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What's the value of x in 6(x+3)=24
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Answer:

X=1

Step-by-step explanation:

6 times x = 6x

6 times positive 3 = 18

6x +18 = 24

     -18    -18

6x = 6

6      6

x = 1 :)

4 0
3 years ago
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Step 1 5x- y= 4
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Answer: C, In Step 2 the expression for y should be subsituted in the other equation.

5 0
2 years ago
Hamish and Harry work as plumbers. Harry earns a dollar more than the amount Hamish earns per hour. The amount Harry earns per h
natulia [17]

Answer:

Hamish and Harry work as plumbers. Harry earns a dollar an hour more than 5/4 the amount hamish earns per hour. harry earns per hour is 2$ less than 7/5 the amount hamish earns per hour. how much do each of them make an hour

Step-by-step explanation:

Let

x is the  amount Harry earns 

y is the amount Hamish earns 

x=(5/4)y+1 ⇒ (x-1)*4/5 = y-------- equation 1

x=(7/5)y-2⇒ (x+2)*5/7 = y-------- equation 2

equals 1 and 2

(x-1)*4/5 = (x+2)*5/7

(4x-4)/5 = (5x+10)/7

(4x-4)*7 = (5x+10)*5

28x-28 = 25x+50

28x-25x = 50+28

3x = 78

x = 26

substitute x = 26 for y=(x-1)*4/5

y = (x-1)*4/5

y =  (26-1)*4/5

y = 20

the answer is

<h3>Harry earns $26 an hour</h3><h3>Hamish earns  $20 an hour</h3>
7 0
3 years ago
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What operation should I use to solve -6x = -24. Addition, subtraction, multiplication,or division
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3 years ago
Equivalent expression
Nataly_w [17]
7(x+8) could work for that
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