What is the value of the expression 4x - 1 / 2 y + x when X is 3 + y - 3

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom

X^2/100+y^2/25=1 the y-intercepts are at: a) (-10,0) and (10,0) b) (0,10) and (0,5) c) (0,-5) and (0,5)

Astudent is solving a system of equations by substitution and comes up with the solution 3 = 3. assuming that he solved the problem correctly, which of the following can be said about this system of equations?