When x = 8.4, y = 6, the value of 9x-5y + 4x-8y

When x = 8.4, y = 6, the value of 9x-5y + 4x-8y

When x = 8.4, y = 6,
9x-5y+4x-8y
=13x-13y
=13×(8.4-6)
=13×2.4
=31.2;
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