AP. E. teacher wants to make groups to play different games. He wants the same number of girls as boys in each group and every child is in a group. If there are 35 girls and 21 boys, what is the greatest number of groups that can be
formed?

9
7
8
14

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.

step-by-step explanation:

for exempl this   system of equations   y = x - 3

                                                                y = 2x - 5

look   the line : y = x -3     ( red)

                            the line : y = 2x -5 ( bleus)