Given that 3x+2y=5a+b and 4x-3y=a+7b, solve for y-x in terms of a and b.

y - x = - 2 b

Step-by-step explanation:

Given-

3 x + 2 y = 5 a + b(i)

4 x - 3 y = a + 7 b(ii)

Multiply by 3 and 2 in equation (i) & (ii) respectively-

Add equation (iii) &  (iv)-

9 x + 6 y = 15 a + 3 a(iii)

8 x - 6 y = 2 a + 14 b (iv)

17 x = 17 a + 17 b

x = a + b

Put x = a + b in equation (i)-

2 y = 5 a + b - 3 a - 3 b

2 y = 2 a - 2 b

y = a - b

∴ y - x = a - b - ( a + b )

y - x = a - b - a - b

y - x = - 2 b

what? ?

what type of question is thiss

step-by-step explanation:

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