Which bar díagram represents the equation
5x + 7.5 =15 ?

C ( i took the test a while ago, im gonna assume its the same answer )

Step-by-step explanation:

x= 1.5  ( the anwer to the equation )

How to: isolate the variable by dividing each side by factors that dont contain the variable.

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