For the first one a=4 cuz 4x4=16
Reduced by 20% due to the fact that $40 dollars was removed which is 20% of 200.
How to find: 40/200x100
Hopefully this helps you
You put a variable for unknown numbers. 5. 96-x and 6. 17+x
Hi there!
The way that an infinite number of solutions is achieved is when the two equations, when solved together, get an answer which is just a number equal to the same number. To do this, first substitute 6x-b in for y in the second equation.



Now, we see that b needs to be equal to -3 when multiplied by -1/2. When both sides are divided by -1/2, b becomes equal to 6. Thus, b must be 6.
Check work:




Thus, as they are equal to each other, the answer is correct. b = 6.
Hope this helps!