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Algebra
Tutor: None Selected Time limit: 0 Hours

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

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Mar 16th, 2015

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Mar 16th, 2015

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