Question

Pls do an elimination method to find x and y.Thanks!Pls help me it's been 1 hour

Answer 1

16)

15x + 7y = -5 ⇒ -10(15x + 7y = -5) ⇒ -150x - 70y = 50

11x + 10y = -28 ⇒ 7(11x + 10y = -28) ⇒ 77x + 70y = -196

-73x = -146

x = 2

11x + 10y = -28

11(2) + 10y = -28

22 + 10y = -28

10y = -50

y = -5

Answer: x = 2, y = -5

18)

7x - 4y = 1 ⇒ 1(7x - 4y = 1) ⇒ 7x - 4y = 1

5x + 2y = -9 ⇒ 2(5x + 2y = -9) ⇒ 10x + 4y = -18

17x = -17

x = -1

7x - 4y = 1

7(-1) - 4y = 1

-7 - 4y = 1

-4y = 8

y = -2

Answer: x = -1, y = -2