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const2013 [10]
3 years ago
11

How to solve 4y=x 3x- y=70 using substitution

Mathematics
1 answer:
creativ13 [48]3 years ago
7 0
X = 4y
3x - y = 70

substitute the x in the second equation with the other half of the first equation.

3(4y) - y = 70
12y - y = 70
11y = 70
y = 6.36 repeating, or 6 4/11

now use this to solve first equation
x = 4 (6 4/11)
x = 25.45 repeating

done
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seropon [69]

Answer:

x2-14x+52 is the answer in my calculation.

8 0
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-81= −45−9n i need help please
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-45 - 9n = -81

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Hope this helps you. :)

4 0
3 years ago
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icang [17]

Answer:

\huge\boxed{14\ \text{and}\ 7}

Step-by-step explanation:

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\text{Substitute (1) to (2):}\\\\\dfrac{1}{2m}+\dfrac{1}{m}=\dfrac{3}{14}\\\\\dfrac{1}{2m}+\dfrac{1\cdot2}{m\cdot2}=\dfrac{3}{14}\\\\\dfrac{1}{2m}+\dfrac{2}{2m}=\dfrac{3}{14}\\\\\dfrac{1+2}{2m}=\dfrac{3}{14}\\\\\dfrac{3}{2m}=\dfrac{3}{14}\Rightarrow2m=14\qquad\text{divide both sides by 2}\\\\\dfrac{2m}{2}=\dfrac{14}{2}\\\\\boxed{m=7}

\text{Substitute it to (1):}\\\\n=2\cdot7\\\\\boxed{n=14}

8 0
2 years ago
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Step-by-step explanation:256

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