Match the graphs with their linear equations.

y = x

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y = - x

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y = x + 1

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Solution

In the first graph,

If $x = 1 ⟹ y = 1$
If $x = 2 ⟹ y = 2$
If $x = - 1 ⟹ y = - 1$
So the equation is $y = x$

In the second graph,

If $x = 1 ⟹ y = - 1$
If $x = 2 ⟹ y = - 2$
So the equation is $y = - x$

In the third graph,

If $x = 1 ⟹ y = 2$
If $x = 2 ⟹ y = 4$
So the equation is $y = x + 1$

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