If anyone could please help me with both these questions if not then at least do one I would appreciate it a lot! Please and Thank You!

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

Which two undefined geometric terms always describe figures with no beginning or end?