\left \{ {{4y+5x=22} \atop {y=-4x+22}} \right. \\substitute\ second\ equation\ into\ the\ first\ one\\4(-4x+22)+5x=22\-16x+88+5x=22\-11x+88=22\ \ \ | subtract\ 88\-11x=-66\ \ \ \ | divide\ by\ -11\x=6\y=-4x+22=-4*6+22=-24+22=-2
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