The number 40 is increased by 75% the result is then deacreased by 50% what is the final number

35

Step-by-step explanation:

75% of 40 is 30

40+30=70

70/2=35

f

step-by-step explanation:

f

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