Question

How do you evaluate the expression `x+8y` when y=7 and x=4?

Answer 1

The answer is `60`.

Explanation:

Evaluate `color(red)x+8color(limegreen)y` when `color(limegreen)y=color(limegreen)7` and `color(red)x=color(red)4`

Substitute `color(red)4` for `color(red)x` and `color(limegreen)7` for `color(limegreen)y`.

`color(red)x+8color(limegreen)y=color(red)4+8(color(limegreen)7)=4+56=60`