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4x +7y = 5
4x +7y = 5
4(-1 -y) +7y = 5
-4 -4y +7y = 5
3y = 5 +4
3y = 9
y = 9/3
y = 3
x = -1 -y
x = -1 -3
x = -4
Maka, nilai :
2y² -5x
= 2(3)² -5(-4)
= 2(9) +20
= 18 +20
= 38
Itu jawabannya.