Which system below has no solution? O y=-4 * and y= 2 x - 3
Oy= 4 * and y= 2 x-3
Oy=.4 and y= 2 x + 3
y=-4 and y= 2 x-3

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Ответ:

reagriffis24

14.08.2020

Mathematics

b) 5:7 = 15:21

Step-by-step explanation:

This questions tests our understanding of enlargement ratios.

#Determine the decimal equivalents or simplify to see which one is correct:

#a) 5:21 = 7:15

$\frac{5}{7}=0.7143\\\\\frac{7}{15}=0.4667\\\\5:7\neq 7:15$

#b) 5:7 = 15:21

$=\frac{5}{7}\\\\=\frac{15}{21}=\frac{5}{7} \# dividing \ by \ 3\\\\$ $\frac{5}{7}=\frac{15}{21}$

#c) 5:7 = 21:15

$\frac{5}{7}=0.7143\\\\\frac{21}{15}=1.4\\\\\frac{5}{7}\neq \frac{21}{15}$

#d) 21:5 = 15:7

$\frac{21}{15}=1.4\\\\\frac{15}{7}=2.1429\\\\\frac{21}{15}\neq \frac{15}{7}$

Hence, option b is the correct one as 5:7 = 15:21

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Which system below has no solution? O y=-4 * and y= 2 x - 3 Oy= 4 * and y= 2 x-3 Oy=.4 and y= 2 x + 3 y=-4 and y= 2 x-3