Answer:
you can plug in for variables, so if x = 3, then 4x = 12, because 4x = 4(3): this is the "substitution" property. ... If x + 2 = 10, then x + 2 + (–2) equals what, and why? ... to solve it, I'd have subtracted 2 from both sides, and simplified to get x = 8.
Step-by-step explanation:
