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# Coordinates

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Find the value of a so that the points A(6, 2a) and B(-a, -2) lie on a line having slope 7.

Feb 21, 2022

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The slope formula is $${y_2 - y_1}\over{x_2-x_1}$$

We can write this as an equation: $${{2a + 2 } \over {6+a} }= 7$$

Multiply both sides by $$6 + a$$,

Then solve for a.

Feb 21, 2022