Answer:
4) ?
there is something wrong. none of the solution options fit to the original equation. you must have missed something.
maybe it is 7y=... to begin with. or there is a y/7 in the solution options.
Step-by-step explanation:
this is the result, if your original equation is correct :
y = 7x - 7z - 9
y + 7z = 7x - 9
y + 7z + 9 = 7x
x = y/7 + z + 9/7
we always have to apply an operation to both sides of the "=" sign to keep the overall value and validity of the expression unchanged.
so, as mentioned, either we started with 7y, or the answer has to contain y/7.
or something else is wrong here entirely.
