Does \( (-40,45) \) make the equation \( y=-x \) true?

Step 1 ：Substitute \((x, y) = (-40, 45)\) into \(y = -x\).

Step 2 ：Calculate \(45 = -(-40)\).

Step 3 ：Not true, so \((-40, 45)\) does not make \(y = -x\) true.