Question

x-5y=45
the value of y when x equals 5

Answer 1

the answer is -8

Answer 2

What value of y would you need when x=5 to keep that statement true?

x-5y=45
x=45+5y
x-45=5y
(5)-45=5y
-40=5y
y=-8

Answer 3

First, solve for y:
\[x-5y = 45 \rightarrow -5y = 45 - x \rightarrow y = - \frac{ 45 - x }{ 5 }\]
And plug in x:
\[- \frac{ 45 - 5 }{ 5 } \rightarrow - \frac{ 40 }{ 5 } \rightarrow -8\]

Answer 4

thanks