Answer is y=24, z=5
Reason
We can solve by substitution method
We know
y=9+3z
y=39-3z
substitute the first “y” value into the other
9+3z=39-3z
Solve for z
combine like terms
3z +3z = 39-9
6z = 30
Solve for z by dividing both sides by 6
z=5
Now you can solve for “y”
Substitute z value into formula
Y= 9+(3)(5)
Y=24
Now check your work and substitute your answers into the formulas
24=9+(3)(5)
24=24
and
24=39-(3)(5)
24=24