Answer:
x = 1, y = -2
Step-by-step explanation:
15x + 3y = 9 (1)
10x + 7y = -4 (2)
3 × (2) - 2 × (1)
3 × (2)
30x + 21y = -12 (3)
2 × (1)
30x + 6y = 18 (4)
(3) - (4)
15y = -30
y = -30 / 15
y = -2
sub y = -2 into (1)
15x + 3y = 9
15x + (3 × -2) = 9
15x - 6 = 9
15x = 9 + 6
15x = 15
x = 15 / 15
x = 1
Step-by-step explanation:
9x+6x=135
15x=135
x=9
9x=81
6x=54
Answer: 1.) 2n 2.) z+6 3.) 20 years old
Step-by-step explanation:
27. You can do this by thinking of all the pairs that add up to 9( 1 and 8, 2 and 7, 3 and 6, 4 and 5) and arrange them to get numbers.