Can anyone explain this please

3^2 = 3 × 3 = 3 + 3 + 3 = 9

5^2 = 5 × 5 = 5 + 5 + 5 + 5 + 5 = 25

7^2 = 7 × 7 = 7 + 7 + 7 + 7 + 7 + 7 + 7 = 49

If a number has that little 2 above it, just multiply that number by itself.

answer: true

step-by-step explanation:

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18