John and Jane are Two Brands Of Shoes .John sells for R7,20 for 8 pairs whiLe Jane Sells For R7,76 for Pairs Which Brand Is The Cheapest​

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

answer: median

step-by-step explanation:

the median is the middle value when a data set is ordered from least to greatest

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0