Answer:
-1/2x+1 is the equation.
Step-by-step explanation:
By using the Pythagorean theorem:
b^2+3^2=5^2b^2+9=25
b=sqrt (25-9)
b=sqrt(16)
b=4
=> 4^2+7^2=c^216+49=c^265=c^2=>c=sqrt(65)
c = (approximately) 8