X^2+y^2=20
X+y=6
sistema de ecuaciones de segundo grado
ayuda por favor ​

What is the value of x in the this question ?

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?

Mario is constructing a frame for 10 in. by 8 in. photo. he wants the frame to be the same with all the way around in the same area of the frame and photo to be 120 square inches what is the dimension of the frame?