新SAT官方Daily Practice每日一题计算题(9.1)

小站整理2017-09-04 16:18:33

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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.


9月SAT数学官方每日一练,点击进入


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.

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