Answer:
a)
s = 4 - 9
s = -5
b)
x = 3 + 7
x = 10
c)
m =1 +8
m = 9
d)
n = 20 + 10
n = 30
Step-by-step explanation:
You want the variable on one side of the equation to solve.
So we move the numbers on the left side to the right, when you do this you use the opposite operator. Addition and subtraction are opposite operators.
