Substitution
Solve x + y if x = 2 and y = 7
9
2(x + 1)
2x + 2
(x + 1) + (x + 2)
2x + 3
(x + 1) - (x + 2)
-1
5x + 20
5(x + 4)
Solve x - y if x = 9 and y = 1
8
3(3x - 1)
9x - 3
(2x +1) + (3x + 5)
5x + 6
(2x + 5) - (x - 3)
x +8
3x - 36
3(x - 12)
Solve 2x + 1 if x = 4
9
(2x - 2)4
8x - 8
(4x - 5) + (2x - 3)
6x + (-8)
(3x + 1) - (-3x + 3)
6x + (-2)
5x + 20y
5(x + 4y)
Solve x + 2y if x = 7 and y = 2
11
-3(2x + 7)
-6x + (-21)
(-x + 5) + (x - 1)
4
(2x + 1) - (3x + 5)
-x + (-4)
12x - 32y
3x - 8y
Solve 2x - 3y if x = 10 and y = 3
11
2x(y + z)
2xy + 2xz
(-3x - 6) + (-5x - 2)
-8x + (-8)
(-3x - 6) - (-5x - 2)
2x + (-4)
20xy + 15x
5x(4y + 3)