Answer:
x= sqrt{25-y^2}
x =-sqrt{25-y^2}
x= sqrt{5-y}
x= -sqrt{5-y}
Explanation:
a. x^2+y^2=25
subtract by y^2 on both sides
-y^2 -y^2
x^2 =25-y^2
square root on both sides to remove x^ 2 and y^2
x= sqrt{25-y^2}
x =-sqr{(25-y^2}
b. y=5-x^2
swap the numbers that have the variable x to the left
5-x^2=y
subtract 5 from both sides
5-x^2=y
-5 -5
-x^2 =y-5
divide by -1 on both sides to make x positive
-1x^2 = y-5
-1 -1
x^2 =5-y
square root of both sides to remove x^2 and y^2
x= sqrt{5-y}
x= -sqrt{5-y}