Question

Dada a equação 5x+y=11, determine a solução quando: a)x=1
b)x=-2
c)y=1
d)y=-4

Answer 1

a)x=1

5x+y=11

5 . ( 1 ) +y=11

5  +y=11

y = 11 - 5

y = 6

b)x=-2

5x+y=11

5 . ( - 2 ) +y=11

- 10  +y=11

y = 11 + 10

y = 21

c)y=1

5x+y=11

5x+( 1 ) =11

5x = 11 - 1

5x = 10

$x=\frac{10}{5}$

x = 2

d)y=-4

5x+y=11

5x+ ( - 4 ) =11

5x - 4 = 11

5x = 11 + 4

5x = 15

$x=\frac{15}{5}$

x = 3