Question

What is the value of `4-xy+3xy` when `x=2` and `y=-3`?

Answer 1

See a solution process below:

Explanation:

Substituting `color(red)(2)` for `color(red)(x)` and `color(blue)(-3)` for `color(blue)(y)`:

`4 - color(red)(x)color(blue)(y) + 3color(red)(x)color(blue)(y)` becomes:

`4 - (color(red)(2) xx color(blue)(-3)) + (3 xx color(red)(2) xx color(blue)(-3)) =>`

`4 - (-6) + (-18) =>`

`4 + 6 - 18 =>`

`10 - 18 =>`

`-8`

Answer 2

`-8`

Explanation:

`"substitute the given values for x and y into the"`
`"expression"`

`rArr4-xy+3xy`

`=4-(color(red)(2)xxcolor(blue)(-3))+(3xxcolor(red)(2)xxcolor(blue)(-3))`

`=4-(-6)+(-18)`

`=4+6-18`

`=-8`