To isolate "vi" in the equation 2.8=22.2-vi/4, you can multiply both sides of the equation by 4:
2.8(4) = (22.2 - vi/4)(4)
11.2 = 88.8 - vi
Subtract 88.8 from both sides:
11.2 - 88.8 = 88.8 - vi - 88.8
-77.6 = -vi
To solve for "vi", you can multiply both sides of the equation by -1:
(-77.6)(-1) = (-vi)(-1)
77.6 = vi
Therefore, vi = 77.6.
2.8=22.2-vi/4
2.8(4)=22.2-vi
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