How do i cancel this this is the only thing i don't have an a on my class never get these

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

50 will mark show all use the linear combination method to solve the system of equations. explain each step of your solution. if steps are not explained, you will not receive credit for that step. 2x+9y= -26 -3x-7y=13

C. using a standard deck of 52 cards, the probability of selecting a 4 of diamonds or a 4 of hearts is an example of a mutually exclusive event. true of false