Can X be affected by slopes but have Y stay constant?

Hello! I am making a 2D platformer game where your speed increases by jumping. I am trying to make it so you do NOT go flying upwards, but you do gain momentum on the X axis. I want the jumping to be constant: sort of like 5 units upward and then slowly falls down, but I would like the X to increase or decrease on slopes. I might be overt$$anonymous$$nking t$$anonymous$$s, but I could use help. If you are confused by my question, I can respond. The sooner the better! Thank you Unity Community!