Translate in problem into algebraic expression. "the difference between twice a number and 4"

(08.01)consider the following pair of equations: x + y = −2 y = 2x + 10 if the two equations are graphed, at what point do the lines representing the two equations intersect? (−4, 2) (4, 2) (−2, 4) (2, 4)

Which of the following statement about pascal's triangle are true?

Tan198=asin164=? how to solve this? ?