ihearttheletterr ihearttheletterr 26-12-2022 Mathematics contestada I CAN DETERMINE IF A VALUE IS TRUE GIVEN AN EQUATION. 9. If x = -3, then which of the following equations are true? Put a checkmark on all that apply. Χ 3-9= 15 -2x+18=24 6x +9=-13 4x-9=-21