为什么直线的平移是上加下减，左加右减 平移坐标的左加右减，上加下减是怎么意思，举例说明一下
\u4e3a\u4ec0\u4e48\u76f4\u7ebf\u7684\u5e73\u79fb\u662f\u4e0a\u52a0\u4e0b\u51cf\uff0c\u5de6\u52a0\u53f3\u51cf\u4e0a\u52a0\u4e0b\u51cf\u662f\u9488\u5bf9\u4e8e\u7eb5\u5750\u6807\u6765\u8bf4\u7684\uff0c\u4e0a\u9762\u662f\u6b63\u6570\uff0c\u4e0b\u9762\u662f\u8d1f\u6570\u3002\u5de6\u52a0\u53f3\u51cf\u662f\u9488\u5bf9\u4e8e\u6a2a\u5750\u6807\u6765\u8bf4\u7684\uff0c\u5de6\u8fb9\u662f\u8d1f\u6570\uff0c\u8981\u52a0\uff0c\u53f3\u8fb9\u662f\u6b63\u6570\uff0c\u8981\u51cf\u3002
\u6bd4\u65b9\u8bf4y=x-2\uff0c\u8fd9\u4e2a\u51fd\u6570\u56fe\u50cf\u5f88\u597d\u753b\uff0c\u659c\u7387\u4e3a\u6b63\u7684\u4e00\u6761\u76f4\u7ebf\uff0c\u5047\u5982\u8ba9\u6b64\u51fd\u6570\u56fe\u50cf\u6cbf\u7740X\u8f74\u8d1f\u65b9\u5411\u79fb\u52a82\u4e2a\u5355\u4f4d\uff0c\u4e5f\u5c31\u662f\u8bf4\u6574\u4e2a\u51fd\u6570\u56fe\u50cf\u5411\u5de6\u79fb\u52a8\u4e24\u4e2a\u5355\u4f4d\uff0c\u90a3\u4e48\u5f97\u5230\u7684\u56fe\u50cf\u5c31\u662fy=\uff08x+2\uff09-2\uff0c\u4e5f\u5c31\u662fy=x\uff0c\u8fd9\u5c31\u662f\u6240\u8c13\u7684"\u5de6\u52a0"\uff1b"\u53f3\u51cf"\u5c31\u662f\u6bd4\u5982\u5c06\u51fd\u6570\u56fe\u50cf\u5411\u53f3\u79fb\u52a82\u5355\u4f4d\u7684\u8bdd\uff0c\u90a3\u4e48y=\uff08x-2\uff09-2\uff0c\u5373y=x-4\u3002
\u8fd8\u662fy=x-2\u8fd9\u4e2a\u51fd\u6570\uff0c\u6bd4\u65b9\u5411y\u8f74\u6b63\u65b9\u5411\u79fb\u52a8\u4e24\u4e2a\u5355\u4f4d\uff0c\u4e5f\u5c31\u662f\u5c06\u51fd\u6570\u56fe\u50cf\u5411\u4e0a\u79fb\u52a82\u4e2a\u5355\u4f4d\uff0c\u90a3\u4e48\u51fd\u6570\u53d8\u4e3ay=\uff08x-2\uff09+2\uff0c\u5373\u4e3ay=x\uff0c\u8fd9\u5c31\u662f\u6240\u8c13\u7684"\u4e0a\u52a0"\uff0c\u540c\u7406\uff0c"\u4e0b\u51cf"\u65f6\uff0c\u51fd\u6570\u89e3\u6790\u5f0f\u4e3ay=(x-2)-2 \u5373y=x-4\u3002
因为在x轴上以零为分界线右边为正数左边为负数，右边的比左边大，所以左加右减
同理在y轴上上加下减
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