15/48 is he correct answer for the question.
-x+2y=1
+
x-3y=5
______
-y=6 >> y= -6
So x=5+3y=5-18=-13
The ratio 1:2 means there are twice as many dimes as there are quarters. An expression could be n=2d, n being number of quarters, d being number of dimes.
The correct answer would be B E'F' and EF are equal in length.
Use completion of sq method
x^2+y^2+14x+10y-7=0
(x+7)^2+(y+5)^2=7+49+25
(x+7)^2+(y+5)^2=81
so centre is(-7,-5) radius is9
