3x+5y=7;5x-2y=-9
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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 =
x = -1
25x - 10y = -45
25(-1) - 10y = -45
-25 - 10y = -45
-10y = -45 + 25
-10y = -20
y =
y = 2
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