X+2y=4 and -x+y=-7 using substitution method

Step-by-step explanation:

hello :

x+2y=4 (*)

-x+y=-7(**)

by(*) : x = 4-2y

put this value in to (**) : -(4-2y)+y=-7

-4+2y+y = -7

3y = -3

y= -1

but : x=4-2y   so : x=4-2(-1)=6

conclusion : one solution  (6 , -1)

answer: translate the circles so they share a common center point and dilate circle y by a scale factor of 3.