Dada a equação 5x-7y=70, detrmine a solução dessa equação quando: a) x=0 b)x=7 c)y=0 d)y=-5.... Pergunta de ideia deNUNU1234

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December 2019 2 27 Report

Dada a equação 5x-7y=70, detrmine a solução dessa equação quando:

a) x=0
b)x=7
c)y=0
d)y=-5

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Comentários A)x=0
-7y=70
y=-10

b)35-7y=70
-7y=35
y=-5

c)y=0
5x=70
x=14

d) y=-5
5x+35=70
5x=35
x=7

2 votes Thanks 1

Left123 5x - 7y = 70
a) x =0
5 *(0) -7y = 70
-7y = 70
y = -70/7 => y = -10

b) x = 7
5 *(7) -7y = 70
35 - 7y = 70
-7y = 70 - 35
-7y = 35
y =-35/7 => y = -5

c) y = 0
5x - 7*(0) = 70
5x -0 = 70
5x =70
x = 70/5 => x = 14

d) y = -5
5x - 7*(-5) = 70
5x + 35 = 70
5x = 70- 35
5x = 35
x = 35/5 => x = 7

1 votes Thanks 1