Parallel Vectors
1. **State the problem:** We need to find which vectors from the given list are parallel to the vector $$\overrightarrow{FG} = 2a - 3b$$ where $$a$$ and $$b$$ are non-parallel vectors.
2. **Recall the rule for parallel vectors:** Two vectors $$\vec{u}$$ and $$\vec{v}$$ are parallel if there exists a scalar $$k$$ such that $$\vec{u} = k \vec{v}$$.
3. **Check each vector:** We want to see if each vector can be written as $$k(2a - 3b)$$ for some scalar $$k$$.
- Vector 1: $$a - \frac{3}{2}b$$
Compare to $$k(2a - 3b) = 2k a - 3k b$$.
Equate coefficients:
$$1 = 2k \Rightarrow k = \frac{1}{2}$$
$$-\frac{3}{2} = -3k \Rightarrow k = \frac{1}{2}$$
Both match, so this vector is parallel.
- Vector 2: $$10a - 15b$$
Equate coefficients:
$$10 = 2k \Rightarrow k = 5$$
$$-15 = -3k \Rightarrow k = 5$$
Both match, so this vector is parallel.
- Vector 3: $$3a - 2b$$
Equate coefficients:
$$3 = 2k \Rightarrow k = \frac{3}{2}$$
$$-2 = -3k \Rightarrow k = \frac{2}{3}$$
Values of $$k$$ do not match, so not parallel.
- Vector 4: $$-4a + 6b$$
Equate coefficients:
$$-4 = 2k \Rightarrow k = -2$$
$$6 = -3k \Rightarrow k = -2$$
Both match, so this vector is parallel.
- Vector 5: $$2a + 3b$$
Equate coefficients:
$$2 = 2k \Rightarrow k = 1$$
$$3 = -3k \Rightarrow k = -1$$
Values of $$k$$ do not match, so not parallel.
- Vector 6: $$2a - 3b - 4a$$ simplifies to $$-2a - 3b$$
Equate coefficients:
$$-2 = 2k \Rightarrow k = -1$$
$$-3 = -3k \Rightarrow k = 1$$
Values of $$k$$ do not match, so not parallel.
- Vector 7: $$2a - 12b + 4a + 3b$$ simplifies to $$6a - 9b$$
Equate coefficients:
$$6 = 2k \Rightarrow k = 3$$
$$-9 = -3k \Rightarrow k = 3$$
Both match, so this vector is parallel.
**Final answer:** The vectors parallel to $$\overrightarrow{FG}$$ are:
$$a - \frac{3}{2}b, \quad 10a - 15b, \quad -4a + 6b, \quad 6a - 9b$$