Is my mystery number My number has 3 digits
It is less than 130
It is greater than 110
It is even
The sum of its digits is 9
could my mystery number

126

Step-by-step explanation:

If it is less then 130 but more than 110 and it must have a 1 in the number then the other two numbers must equal 8. So what equals 8?

1+7

2+6

3+5

4+4

SOOO knowing this the two that are less then 130 but more than 110 are 126 and 117 but the answer is even so therefore its 126

answer is:

1.75 pounds

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