-3x^2 + 4xy - y^3 x = 5 and Y = 1

-56

Step:

Plug in the numbers into the equation

-3(5)² + 4(5)(1)-1³

Any expression multiplied by 1 remains the same. Evaultuate the power.

-3×25+4×5-1³

Multiply the numbers. 1 raised to any power equals 1.

-3×25+20-1

Multiply the numbers

-75+20-1

Calcualte the sum or difference and you get -56.

Hope this helpsʕ•ᴥ•ʔ