If (x^2-y^2,x+y)= (-7,7) Find the value of X+2y?
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Answer:
11
Step-by-step explanation:
xsquare-ysquare=(x+y)(x-y). but we know that x+y=7 from above given coordinate.substituting itwe get (7)(x-y)= -7 so x-y= -1and we know x+y=7. adding both we get 2x+y-y=6.we get x=3.substituting value of x in any above two equations we get y=4.therefore x=3 and y=4.so x+2y=(3)+2(4)=11