Question 1208177
<pre>
Take advantage of available technology. 
Use a separate letter for every unknown, 
which makes setting up a problem easy.

Let the number of cars = c
Let the cost of a car = x
Let the number of dolls = d
Let the cost of a doll = y

Mr. Thomas spent $1972 on cars and dolls. 

cx + dy = 1972

He bought 3 times as many cars as dolls. 

c = 3d

Each doll cost $10 more than each car. 

y = x + 10

She paid $476 more for the cars than the dolls. 

Cx = Dy + 476

What is the cost of a doll?

Go to this site: 

https://www.emathhelp.net/en/calculators/algebra-2/system-of-equations-solver/?

Where it says "Enter a system of equations, type in 

cx + dy = 1972, c = 3d, y = x + 10, cx = dy + 476

Click "calculate".  

Scroll down and read 

c = 102, d = 34, x = 12, y = 22

Cost of a doll = $y = $22

Edwin</pre>