Question

2y+7x=4 find the value of y when x=5,10,15

Answer 1

Given the expression:

`2y+7x=4`

We have, for the cases when x=5,10 and 15:

`\begin{gathered} x=5 \\ \Rightarrow2y+7(5)=4 \\ \Rightarrow2y=4─35=─29 \\ \Rightarrow y=(─29)/(2) \\ \\ x=10 \\ \Rightarrow2y+7(10)=4 \\ \Rightarrow2y=4─70=─66 \\ \Rightarrow y=(─66)/(2)=─33 \\ y=─33 \\ \\ x=15 \\ \Rightarrow2y+7(15)=4 \\ \Rightarrow2y=4─105=─101 \\ \Rightarrow y=(─101)/(2) \end{gathered}`

therefore, if x= 5, then y= -29/2, if x=10, then y=-33 and if x=15, then y=-101/2