Substitute y for x-5 getting x+3(x-5)=9 use distributive axiom getting x+3x-15=9 combine like terms getting 4x-15=9 add 15 to both sides getting 4x=24 divide by 4 getting: x=6 substitute x into y=x-5 getting y=6-5 combine like terms: y=1 x=6. that’s your answer.
