2x+y=8 and y=x-7 solving systems by substitution

What number line represents the solution set for the inequality -1/2 greater than or equal to 4

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

3a + 5b - 7 = 0 a - 2b - 4 = 0 solve the system by the elimination method. check your work {(96/11, -5/11)} {(34/11, -5/11)} {(32/33, 5/11)}