Evaluate the expression for x= 3 and y= 6.
51x² + y + 3

468

Step-by-step explanation:

The equation is: 51x² + y + 3

Let's first find x.  It says x= 3, so let's subsitute that in.

51(3)² + y + 3

3² is 9 because 3 times 3 is 9, which means:

51(9) + y + 3.  

It is 51 times 9 and not 519 because x was supposed to be squared by itself and 51 was next to it.  When a number is close to another number, especially with parentheses, it wants you to multiply the two together.  

For example: 3(3) is 9 and 4(5) is 20.

Now that we found x, let's get y.  The problem states that y= 6...let's subsitute that in.  

51(9) + 6 + 3.  

Now that we got all the variables out of the way, we can simplify!

51 times 9= 459

459+6+3 is the same thing as 459+9, since 6+3= 9.

459+15= 468  :)

3x + 4y -25 =0 represents the amount of change sianna should recieve