Answer:
s = 10
r = -30
Step-by-step explanation:
Both expressions are equal to "r". You can substitute the first expression for into the second equation and replace "r".
r = r
-3s = 10 - 4s
To solve for the variable "s", keep it on the left side and more everything else to the right. When moving a number, use its reverse operation on the whole equation.
-3s + 4s = 10 - 4s + 4s Add 4s to both sides.
-3s + 4s = 10 "4s" is cancelled out on the right, moved to the left
s = 10 Simplified the left side. Solved for "s"
To find "r", substitute s = 10 into the first equation.
r = -3s
r = (-3)(10) Multiply
r = -30 Solved for "r"
Therefore the solution is when "s" is 10 and when "r" is -30.
