Easiest method solving 2 unknowns is Substitution. So there will normally be 2(ormore)equations given. Say X+Y= a bX=cY + d a b c d are numbers they give So first we rearrange the first equation X = a - Y No we substitute this into the 2nd equation so that we can get Y since we know X = a-Y, b(a-Y) = cY + d we rearrange and we can find Y for this, it is just Y and numbers hence finding Y, we sub the value for Y into X = a-Y and we get X also .
