Answer:
[tex]x = -1[/tex]
Step-by-step explanation:
This is a case of direct proportionaly, that is:
[tex]y \propto x[/tex]
[tex]y = k\cdot x[/tex]
Where k is the proportionality constant, which is:
[tex]k = \frac{y}{x}[/tex]
[tex]k = \frac{35}{5}[/tex]
[tex]k = 7[/tex]
The value of x when y = -7 is:
[tex]x = \frac{y}{k}[/tex]
[tex]x = -\frac{7}{7}[/tex]
[tex]x = -1[/tex]
