Answer:
6. x = 9
7. x = 5, y = 4
Step-by-step explanation:
6. (5x - 15) + (2x - 8) = 20 x 2
7x -23 = 40
7x = 63
x = 9
7. y - 1 = 2y - 5
y = 4
2x - 7 = 3y - 9 = 3 x 4 - 9 = 3
2x = 10
x = 5
