Question

1 Marque a variável:
a) x -5=7
b) x+4
c) y +5=9
d) 4x + 7 = 19

2-Calcule o valor da incógnita x:
x- 45= 70

Answer 1

$\boxed{\begin{array}{lr}1)a)\\x-5=7\\x=7+5\\x=12\\\\b)\\x+4=0\\x=-4\\\\c)\\y+5=9\\y=9-5\\y=4\\\\d)\\4x+7=19\\4x=19-7\\4x=12\\x=12/4\\x=3\\\\2)\\x-45=70\\x=70+45\\\huge\boxed{\sf x=115 }\end{array}}$

1)

R=c)y=4

2)

R=x=115