Question

Evaluate the expression, using the given value of the variable.


7 – 5x + 4x when x = 3



–20


4

30

18

Answer 1

So the way we do this is by substitution. All you have to do is substitute x=3 into the expression. That means you replace the x in 7-5x+4x with 3. Can you try that?

Answer 2

4

Answer 3

Exactly

Answer 4

But try to let the thread starter answer - it would be useful for them to solve for themself

Answer 5

7 – 5x + 4x = 7 - x = 7 - 3 = 4