1)
first of all expand the brackets - multiply everything by the -ve.
43y-19y+8
Then collect like terms (ie y) ->43-19 is 24 so
24y+89
2)
Multiply. 7/9 (b-63)
Do as it says - 7/9 * b is 7/9 b then
7/9 * -63/1 ---> 7*-63 is -441 and 9*1 is 9 so gives
-441/9 which simplifies to 49.Add the two to get ans ->
7/9 b - 49
3)
90= 10(2y+1)
Multiply out the be bracket - 10*2y is 20y then 10*1 is 1.
90= 20y +10
subtract 10 from both sides
80 = 20y
divide both sides by 20
80/20 = y which can be simplified to 8/2 which is 4. y=4
4)
5/3 • (1/4)
5*1 = 5
3*4 = 12
Ans is 5/12