Becky is using the expression 2z + 3 to represent the number of chairs in her classroom. there are twice as many chairs as tables, and there are three extra chairs in the back. what does z represent? the number of chairs. the number of tables. the number of chairs at tables. the number of chairs and tables

The number of tables

Step-by-step explanation:

Let

z ----> the number of tables

y-----> the number of chairs

we know that

therefore

z represent the number of tables

let soccer = x and golf = y

part a

1st equation: x + y = 125

2nd equation: x = y +45

part b

replace x in the 1st equation with the 2nd one:

y + 45 + y = 125

simplify:

2y + 45 = 125

subtract 45 from each side:

2y = 80

divide both sides by 2:

y = 80/2

y = 40

she plays golf for 40 minutes.

part c

no because she plays soccer for 45 minutes longer than golf 40 +45 =   85 minutes, not 80 minutes.