求解一道数学题,英语的!solve the system of equations y=-0.5x and y=1.5x+4 by elimination and graphing.题目我看懂了.但是不会做啊.尤其是那个elimination的做法.求助.
问题描述:
求解一道数学题,英语的!
solve the system of equations y=-0.5x and y=1.5x+4 by elimination and graphing.题目我看懂了.但是不会做啊.尤其是那个elimination的做法.求助.
答
y=0.5x①
y=1.5x+4②
①×3-②得:3y-y=2y=1.5x-1.5x-4=-4
解得:y=-2
x=-4
制图的话:lz画出两条直线,看看交点坐标即可