Answer:
<h2>x = 4, y = 12 → (4, 12)</h2>
Step-by-step explanation:
![\left\{\begin{array}{ccc}10x+2y=64&\text{multiply both sides by 2}\\3x-4y=-36\end{array}\right\\\underline{+\left\{\begin{array}{ccc}20x+4y=128\\3x-4y=-36\end{array}\right}\qquad\text{add both sides of the equations}\\.\qquad23x=92\qquad\text{divide both sides by 2}\\.\qquad x=4\\\\\text{put the value of x to the first equation:}\\\\10(4)+2y=64\\40+2y=64\qquad\text{subtract 40 from both sides}\\2y=24\qquad\text{divide both sides by 2}\\y=12](https://tex.z-dn.net/?f=%5Cleft%5C%7B%5Cbegin%7Barray%7D%7Bccc%7D10x%2B2y%3D64%26%5Ctext%7Bmultiply%20both%20sides%20by%202%7D%5C%5C3x-4y%3D-36%5Cend%7Barray%7D%5Cright%5C%5C%5Cunderline%7B%2B%5Cleft%5C%7B%5Cbegin%7Barray%7D%7Bccc%7D20x%2B4y%3D128%5C%5C3x-4y%3D-36%5Cend%7Barray%7D%5Cright%7D%5Cqquad%5Ctext%7Badd%20both%20sides%20of%20the%20equations%7D%5C%5C.%5Cqquad23x%3D92%5Cqquad%5Ctext%7Bdivide%20both%20sides%20by%202%7D%5C%5C.%5Cqquad%20x%3D4%5C%5C%5C%5C%5Ctext%7Bput%20the%20value%20of%20x%20to%20the%20first%20equation%3A%7D%5C%5C%5C%5C10%284%29%2B2y%3D64%5C%5C40%2B2y%3D64%5Cqquad%5Ctext%7Bsubtract%2040%20from%20both%20sides%7D%5C%5C2y%3D24%5Cqquad%5Ctext%7Bdivide%20both%20sides%20by%202%7D%5C%5Cy%3D12)
That is correct?
Dunno what the question is.
Answer:
x=6f-7 is the correct answer.
Answer:
D
Step-by-step explanation:
We can test each pair making each ratio into its simplest form.
For A 2/3 is already in its simplest form and 9/15=3/5. they are not equivalent.
For B, 5/8 is already in its simplest form and 15/21=5/7. they are not equivalent.
For C, 3/12=1/4, and 6/18=1/3. They are not equivalent.
For D, 4/10=2/5, and 12/30=2/5. They are equivalent.