新SAT官方Daily Practice每日一题计算题(9.1)
- 2017年09月04日16:18 来源：小站整理作者：小站SAT编辑
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摘要：本系列将给大家带来SAT官方的每日一练数学真题，各题型都有，持续更新，希望大家同步多练习。今天这里分享的是9月1日的数学计算题，一起来练习吧！
Read the following sat test question and then click on a button to select your answer.
Which of the following equations represents a line in the x y-plane with an x-intercept (-2,0) and a slope of 4?
A.y=4x+8
B.y=-4x+8
C.y=4x-2
D.y=-4x-2
重点单词：
multiple ['mʌltipl]adj. 许多，多种多样的n. 倍数，并联
option ['ɔpʃən]n. 选择权，可选物，优先购买权v. 给予选
equation [i'kweiʃən]n. 相等，方程(式), 等式，均衡
slope [sləup]n. 倾斜，斜坡，斜面，斜线，斜率
答案：A
解析：
Option A is correct. If the slope of the line is 4, thenan equation for it would be in the form y=4x+b.Then, substituting the x- and y-coordinates of thegiven point to satisfy the equation yields0=4(-2)+b. Solving for b yields b=8, so an equation that represents the given conditions isy=4x+8.
