2x+y=7
solve the literal equation for y

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

It is given that the quadratic equation hx²-3x+k=0, where h and k are constants, has roots [tex] \beta \: and \: 2 \beta [/tex]express h in terms of k