Solve the system of equations:
y = 2x - 3
y = x2 - 3

(0, -3), (2, 1)

Step-by-step explanation:

Solve this by solving for the first variable in one of the equations, then substitute the result into the other equation.

x is the number of plates which costs $5 and y is the number of $10 plates.

the equation: 5x + 10y = 900 and y=2x

by solving these two equations, x=36 and y= 72, so the total number of plates is 108