Question

3x+5y=7;5x-2y=-9
find my question​

Answer 1

Answer:

x = -1

y = 2

Step-by-step explanation:

(3x + 5y = 7) × 2 ------ (i)

6x + 10y = 14 ------ (ii)

(5x - 2y = -9) × 5 ------ (iii)

25x - 10y = -45 ------ (iv)

Add (ii) and (iv)

6x + 10y + 25x - 10y = 14 + (-45)

31x = 14 - 45

31x = -31

x = $\frac{-31}{31}$

x = -1

25x - 10y = -45

25(-1) - 10y = -45

-25 - 10y = -45

-10y = -45 + 25

-10y = -20

y = $\frac{-20}{-10}$

y = 2