help please? substitute

Your answer to number 17 is x=4 because you replace y with 0 and you get 4x-3(0)=16. Then you multiply 3 by 0 to get 0 and get 4x=16 as ur equation. Then you can divide both sides by 4 to get 4 as your x.
Your answer to number 19 is 0 because 3(2x)-6x=0 is also known as 6x-6x=0 which equals 0.
Answer:
17) x=4
19)x= all real numbers
Step-by-step explanation:
Just switch the y for its give value
17) 4x-3(0)=16
3*0=0
4x=16
4x/4=16/4
X=4
19)-6x+3(2x)=0
3*2x=6x.
If you have - 6x and +6x then any number works for x.