Answer:
x
=
21/2
Step-by-step explanation:
Move all terms not containing x to the right side of the equation.
3x=x+21
Move all terms containing x to the left side of the equation.
2x=21
Divide each term by
2
and simplify.
x
=
21/2
The degree of the expression is 2.
<h3><u>The x intercept is -4.</u></h3>
To find the x intercept, all we need to do is replace the value of y with 0.
2x + 4(0) = -8
Solve for x.
2x = -8
Divide both sides by 2.
x = -4.
Answer: 4 miles per hour
Step-by-step explanation: Just divide 12 by 3 .-.