Answer:
[tex]a=3[/tex]
Step-by-step explanation:
we have
[tex]5x-y=8[/tex]
we know that
If a ordered pair lie on the graph of the equation
then
the ordered pair must be satisfy the equation
so
Substitute the value of point [tex](a,7)[/tex] in the equation and solve for a
[tex]5(a)-7=8[/tex]
[tex]5(a)=8+7[/tex]
[tex]5(a)=15[/tex]
[tex]a=15/5=3[/tex]
