Solving systems by addition method

x-3y=-1
-5x+3y=-7

i think i did somethin wrong because for x i got 2 and for y i got 1. but i don't know what i did wrong.

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

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies