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Algebra Difficulty 1.9 Junior Find the answer
If the line that passes through the points (2,7) and (a,3a) has a slope of 2, what is the value of a?
A number or a short expression. Spacing and $ signs are ignored.
Solution
Since the slope of the line through points (2,7) and (a,3a) is 2, then rac{3a-7}{a-2}=2. From this, 3a−7=2(a−2) and so 3a−7=2a−4 which gives a=3.
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