True or false i still don't understand what's happening

3.37

The value of -3xy, for x = 2 and y = 3, is -18

So they are assuming that -3xy = -18 when x = 2 and y = 3 (or when you substitute 2 for "x" and 3 for "y")

-3xy = -18    Since x = 2, you can plug in 2 for "x". Since y = 3, you can plug in 3 for "y"

-3(2)(3) = -18

-3(6) = -18

-18 = -18

This is True because when you plug in 2 for "x" and 3 for "y", the value is -18.

3.38

The value of x³y, for x = -2 and y = 3, is -24

So when you plug in -2 for "x", and 3 for "y", the value of x³y should equal -24

x³y = -24  Plug in -2 for "x", and 3 for "y"

(-2)³ · (3) = -24

(-2 · -2 · -2) · (3) = -24

(-8) · (3) = -24

-24 = -24

This is True because when you plug in -2 for "x". and 3 for "y", the value of x³y is -24.

3.40

The value of 2(x + y)², for x = 7 and y = 3, is 200

So when x is 7 and y is 3, the value or the result of 2(x + y)² should equal 200.

2(x + y)² = 200      Plug in 7 for "x", plug in 3 for "y"

2(7 + 3)² = 200     Add 7 and 3

2(10)² = 200       Square 10

2(10 · 10) = 200  >  2(100) = 200          Multiply 2 and 100

200 = 200

This is True because when x = 7 and y = 3, the value of  2(x + y)² is 200.

36

step-by-step explanation: