Answer:
[tex]r1=\frac{d}{t}-r2[/tex]
Step-by-step explanation:
we have
[tex]d=(r1+r2)t[/tex]
Solve for r1
That means -----> Isolate the variable r1
Divide by t both sides
[tex]\frac{d}{t}=r1+r2[/tex]
Subtract r2 both sides
[tex]\frac{d}{t}-r2=r1[/tex]
Rewrite
[tex]r1=\frac{d}{t}-r2[/tex]
