Evaluate -4x – 4y + 7 when x = 6 and y = -2.
Note
Substitute the given values carefully: -4(6) - 4(-2) + 7 = -24 + 8 + 7 = -9. A common mistake is to ignore the sign of y or the sign of the coefficient.
Evaluate -4x – 4y + 7 when x = 6 and y = -2.
Substitute the given values carefully: -4(6) - 4(-2) + 7 = -24 + 8 + 7 = -9. A common mistake is to ignore the sign of y or the sign of the coefficient.