y=x−5; 2x+y=13
Solve y=x−5 for y:
Substitute x−5 for y in 2x+y=13:
2x+y=13
2x+x−5=13
3x−5=13(Simplify both sides of the equation)
3x−5+5=13+5(Add 5 to both sides)
3x=18
3x/3=18/3(Divide both sides by 3)
x=6
Substitute 6 for x in y=x−5:
y=x−5
y=6−5
y=1(Simplify both sides of the equation)
