Question

dada a função y=5x-4 determine o valor de
x=2
x=3
y=21
y=31

Answer 1

y=5x-4
y=5.2-4
y=10-4
y=6
y=5.3-4
y=15-4
y=11
21=5x-4
21+4=5x
25=5x
25/5=x
x=5
31=5x-4
31+4=5x
35=5x
35/5=x
x=7