Solve 15x+3y=9,10x+7y=-4

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