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Algebra
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Mar 16th, 2015

The answer is option a

The easiest way to see this is to look at the point of intersection -which must lie on both of the lines/

Now (2, -2) means x = 2 and y = -2

Checking -0.5x -0.3 y = -0.5*(2) - 0.3 *(-2) = -1 + 0.6 = -0.4 as required

and 0.1 x - 0.2y = 0.1 *(2) -0.2 * (-2) = 0.2 + 0.4 = 0.6 as required

(The other two options don't work)

The long way is to write the equations in standard form and check the lines

Example 0.1x -0,2 y=  0.6

Multiply by 10

x -2y = 6    or y = 1/2x -3 which is one of the lines (slope 1/2 and intercept -3)

Mar 16th, 2015

Are you happy with this or do you need more help

Mar 16th, 2015

Are you happy with this or do you need more help

Mar 16th, 2015

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