For what value of x is line a parallel to line b

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers