The positive value is which is approximately 0.732.8 . D
First multiply both sides by y – 4a to clear the denominator:
Now move all terms with y to the left and all terms without y to the right:Now factor the left side and divide to isolate y:9 . B
With only two equations, you won’t be able to get numerical solutions for
three unknowns. But apparently you can get far enough to rule out four
of the five answer choices. How? Look for a way to combine the
equations that leads somewhere useful. Notice that the first equation
contains + ky and the second equation contains – ky, so if you add the
equations as they are, you’ll lose those terms: