Checking account a charges a monthly fee of $10 and a per check fee of $.10 and checking account b charges a monthly fee of $12 and a per check fee of .05. how many checks would a person have to write for the two accounts to cost the same

We need to establish a formula where the costs of both accounts are equal.

For account 1, we have a fixed cost of 10 and a variable cost of .10 we would write the cost formula as .1x+10

For account 2, we have a fixed cost of 12 and a variable cost of .05, we write this formula as 12 + .05x

Set the two formulas equal to each other

.1x+10 = 12+ .05x

Solve for X

.05x= 2

x= 40

Someone would need to write 40 checks to make the two checking accounts equal.

y=mx+b is the right slope of velocity carry the 4 over