Barney spent $70 on 3 shirts and 2 pairs of pants
Robin bought 1 shirt and 4 pairs of pants for $90
Let x be the cost for each shirt
Let y be the cost for each pair of pants
3x+2y=70 (1)
x+4y=90 (2)
Having this system of equations, we can graph on the graph calculator:
The solution of two linear equations corresponds to the intersection of the two lines because the coordinate pair naming every point on a graph is a solution to its corresponding equation:
In this case the solution is: (10, 20) and corresponds to the cost of the shirt and pant.
Shirt: $10
Pant:$20
