How can you write a pair of fractions as fractions with a common denominator

U find multiples of both denominators and then us the least number that matches both as the new denominator then multiply your other two fractions to get the same denominator that u got in your multiples and then multiply whatever number you have with your number you multiply by to get the denominator on both fractions

not very good at explaining things but I really hope this helps

The first one is correct