If 1 inch = 2.54 cm, how many centimetres (cm) are there in 5 inches (in.)? *

5 inches = 12.7 cm

Step-by-step explanation:

12.7

Step-by-step explanation:

if x = 2.54

then 5x = 12.7

5 x 2.54 = 12.7cm

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

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