3x - 2y = 20
Subtract 3y from both sides to get the y-variable on one side of the equal and the rest on the other.
-2y = - 3x + 20
Now divide by -2 on both sides to isolate the y-variable.
y = -3x/-2 + 20/-2
y = 3/2x - 10
Answer:
Step-by-step explanation:
let speed of Stephen=x mph
speed of Diana=x+4
then
6x+6(x+4)=276
divide by 6
x+x+4=276/6=46
2x=46-4=42
x=42/2=21
Stephen is traveling at 21 mph.
Diana is traveling at 21+4=25 mph.
