Sandy's cost equation is y = 5x + 10 where y = cost and x = number of children.
Kimmi's cost equation is y = 25 where y = cost.
The fees are the same when x = 3 in other words when Sandy babysits 3 children.
That is found by solving 5x + 10 = 25 for x.
Subtract 10 from each side: 5x = 15
Divide by 5 on both sides: x = 3
Answer:
just use algebraic expression
Answer:


And replacing we got:

And for this case we can use the first point to find the intercept like this:

And solving we got:

And then the line equation would be given by:

Step-by-step explanation:
For this case we have the following two points given:

And for this case we want an equation for a line with the two points given by:

Wher m is the slope and b the y intercept. We can find the slope with this formula:

And replacing we got:

And for this case we can use the first point to find the intercept like this:

And solving we got:

And then the line equation would be given by:

Answer: 4x+20
Step-by-step explanation:
Take the number outside the parentheses, and multiply it by each number inside it, one at a time.
then you simply just combine them.