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4x+7y =5 - 4x + 4y = -4
3y = 9
y = 9/3
y = 3
x+y=-1
x+3 =-1
x =-1-3
x =-4
2y² - 5x= 2. (3²) - 5.-4
= 2 . 9 +20
= 18 + 20
= 38