there are 4 pens in each pack of black pens, 5 in a pack of red pens and 6 in a pack of green pens on monday 7:3:4 pens were sold. a total of 268 pens were sold work out the number of red pens sold

mental cunning

explanation:

he is often referred to as a man of twists and turns

answer: just subtact the units and then add the non negative : happy to

step-by-step explanation:

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