Question 1108816
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From the condition, you have this system of two equations in two unknowns

 x +  y = 15,    (1)
2x + 3y = 35.    (2)


From equation (1), express  y = 15-x  and substitute it into equation (2), replacing y.
In this way, you will get a single equation for only one unknown x, which is your main interest.


2x + 3*(15-x)  = 35.     (It is how the Substitution method works.)


Simplify and solve it for x:

2x + 45 - 3x = 35  ====>  -x = 35 - 45  ====>  -x = -10  ====>  x = 10.


<U>Answer</U>.  10 large baskets.
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Solved.


On the way, you learned on how the Substitution method works.