X=7 7 is the value of this math problem
Answer:
a=-8
b=-29
Step-by-step explanation:
Let's assume
first number is a
second number is b
the difference of two numbers,a and b,is 21
so, we get

we can solve for 'a'

the difference of five times a and two times b is 18
so, we get

now, we can plug 'a'

now, we can solve for b




now, we can find 'a'


Answer:
Missing number = 3
Step-by-step explanation:
Let
be the missing number. We have the following:

I would say (b. $8) but wait for someone else too answer just in case I’m wrong