I need help solving these equations for the unknown?

Question

4y+2divided by 2=21solve for y
a+4=3a-81solve for a
146=36y+2divided by4=236.5solve for y

Answer 1

Answer 1:
(4y + 2)/2 = 21
4y + 2 = 21*2
4y + 2 = 42
4y = 42 - 2
4y = 40
y = 40/4
y = 10

Answer 2:
a + 4 = 3a - 81
a = 3a - 81 - 4
a = 3a - 85
a - 3a = -85
-2a = -85
2a = 85 (The minus signs cancel each other out)
a = 85/2 (or) 42.5

Answer 3:
146 = (36y + 2)/4 = 236.5?
This means that 146 = 236.5 which is never possible
This implies that the equation has no solution.

Answer 2

(4y+2)/2 =21
4y+2=21x2=42
4y=42-2=40
y=40/4=10

a+4=3a-81
a+4-3a= -81
4-2a= -81
-2a= -81-4 = -85
a = -85/-2 = 42.5

146=(36y+2)/4=236.5
y either has 2 values or the equation is illogical since 146 is not equal to 236.5
Either:
146=(36y+2)/4
Multiplying both sides by 4: 584=36y+2
36y=584-2=582
y=582/36=16.166666

Or:
36y+2=944
y=944/36=26.222222

Answer 3

(i) the equation is
(4y+2)/2 = 21, 2 is common factor to 4y and 2 and thus LHS reduces to 2y+1 taking 1 to other side of the equation we get
2y=20 thus y=10 is the solution.
(ii) arranging known on one side and unknowns on other side of the equation we have
2a=85 thus a=42.5 is the solution.
(iii) There seems some typographical mistake.

Answer 4

for 4y+2divided by 2=21
2(y+1)/2=21
y+1=21
y=21-1
y=20

for a+4=3a-81
3a-a-81-4=0
2a-85=0
2a=85
a=42.5

third question is invalid plz check then ask.

Answer 5

ok silly girl.... do your own homework.....

tis easy: remember two things

isolate your variables and do the same things to both sides of the equation.......

Answer 6

its verry easy do your home work by your self.