Question

What is `2x+y -4` when `x=5` and `y = -3.2`?

Answer 1

2.8

Explanation:

Here 2x means `2xxx`

Substitute the given values into the expression

`2x+y-4=(2xx5)+(-3.2)-4`

now +(-3.2) is equivalent to - 3.2

hence `(2xx5)-3.2-4=10-7.2=2.8`