How do u solve this step by step and also pls don’t answer unnecessarily

Step-by-step explanation:

D) a) 2x = x +4

Subtract 'x' form both sides

2x - x = x - x + 4

x = 4

b) 3x = 2x + 3

Subtract '2x form both sides

3x - 2x = 2x - 2x +3

x = 3

c) 6x = 2x + 8

Subtract '2x' from both sides

6x - 2x = 8

4x = 8

Divide both sides by 4

4x/4x =8/4

x = 2

e) 5x = 12 - x

Add 'x' to both sides

5x +x = 12 - x + x

6x = 12

Divide both sides by x

6x/6 =12/6

x = 2

E) k) 15x + 4 = 10x + 19

Subtract 10x from both sides

15x - 10x + 4 = 10x - 10x + 19

5x + 4 = 19

Subtract 4 form both sides

5x + 4 - 4 = 19 - 4

5x = 15

Divide both sides by 5

5x/5= 15/5

x = 3

d

step-by-step explanation:

given

y + 3 = - 4(x - 2) ← distribute the parenthesis

y + 3 = - 4x + 8 ( subtract 3 from both sides )

y = - 4x + 5 → d

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value