Question

find the value of y when x equals -20


x+3y=7

Answer 1

x=-20


Plug in -20 into the equation to get y.


-20+3y=7


3y=27


y=9

Answer 2

x+3y=7
Substitute -20 for x
-20+3y=7
Add 20 to both sides
3y=27
Divide 3 on both sides
Final Answer: y=9