How do i substitute y=x to 3x+2y=20

Where ever u see a y change it to an x
3x+2(x)=20
5x=20
x=4

Hello there,

How do i substitute y=x to 3x+2y=20

Answer : since both are equal , you can change the letters to the same one.
3x + 2x = 20
5x = 20 
x = 5
Therefore y = 5 

Hope This Helps You!
Good Luck Studying :)

Is 8.50 an answer or no? ?

If jon had $4.00 then takes away $2.25, then he should have $1.75 left. $4.00 - $2.25 = $1.75 hope this ; )