Question

Y=1/2x-3 and 9x-2y=-74 substitution

Answer 1

Hello : 
Y=1/2x-3  ...(1)
 and
9x-2y=-74....(2)
subsct in (2)  :
9x-2(1/2x-3) = -74
9x-x+6 = -74
8x =-80
x = -10
in(1) : y =1/2(-10)-3
          y = -8

Answer 2

x=2(y+3)x=​9​​2(y−37)​​