which number is a factor of 40?
2 x 5
2 x 20
2 x 2 x 2 x 5
2 x 2 x 4 x 5

2 x 2 x 2 x 5

Step-by-step explanation:

40 = 4 * 10

Factor

      = 2*2   * 5*2

Putting them in order from smallest to largest

      = 2 *2 * 2 *5

2 x 5  = 10

2 x 20 =40  Factor of 40

2 x 2 x 2 x 5 = 40   Prime factorization of 40

2 x 2 x 4 x 5 = 80

I think you are looking for the prime factorization of 40, which means breaking the numbers down into primes.

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

y = 5x + 17

step-by-step explanation:

a perpendicular line will be the opposite reciprocal slope of the given equation.   the slope given is -1/5 so the opposite reciprocal is 5

find b:

7 = 5 (-2) + b

7 = -10 + b

17 = b

write equation

y = 5x + 17