Answer: x + 9y = 3
Explanation:
By looking at the two given equations, we can see that they are ratios of each other, or in other words, they are proportional. In the first equation, everything in the second equation is multiplied by 2 (1 * 2 = 2, 9 * 2 = 18, ? * 2 = 6).
Using this information, we can divide 6 by 2 to find ?.
? = 6 / 2 = 3
2x + 18y = 6
x + 9y = 3