As y=0 in both d cases.d point will lie on d x-axis. Now d distance between 7 nd -8 is 15 blocks.we know each block is of 1cm on d graph.hence d distance between d points is 15 cms.,

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Using distance formula √{(x₁ - x)² + (y₁ - y)²}
so √{(7 + 8)² + (0 - 0)²}
so 15 units
 is the answer