Which of the following expressions are written in scientific notation .98 x 10 2 or 2.79 x 10 -3 or 838 x 10 5 or 1,784,879

5/6

step-by-step explanation:

if i remember correctly with perpendicular stuff you just take away the negative

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

step-by-step explanation: