Here are my questions! Thank you!

Question 1 : Let F be a linear application of RS in R such that F(x,y.z)=(2x, 4x-y, 2x+3y-z), then: a) F is injective but not overjective b) F is surjective but not injective c) F is neither injective nor overjective d) F is an isomorphism Question 2: The vectors (1, -2) and ( 4, -7) form a base for R2. Let F be a linear application verifying F(1, - 2)=(-1, 1) and F(4, -7)=(-3, 4), then: a) F(x, y)=(x+y,x2 ) b) F(x, v)=(3x+2y,x ) c) F( x, y) = ( x+x x ) [d) None of the above