A man bought a cow and a calf for 990 dollars paying eight times as much for the cow as for the calf. What was the cost of each?

Let x = the cost of the calf.  The cow costs 8 times as much, so it costs 8x.  Together they cost $990:

   x + 8x = $990

Step-by-step explanation:

answer: domain and range mean all possible values of x and y that could be substituted to the inequality. a solution means all possible values that make the inequality statement true. so while the range is still all real numbers, the solution is the shaded area, for which y will always be greater than the line of the function.