Question

como fas essas conta? 7.y-23=4.(y+1)

4(5y+y)=210

3(6+3y)+2=2.(y-9)-1

9y-5+4y=7.y+2.y+3

Answer 1

a) 7y-23=4(y+1)
7y-23=4y+4
7y-4y=4+23
3y=27
y=27/3
y=9

b)4(5y+y)=210
4.6y=210
24y=210
y= 210/24
y= 35/4

c) 3(6+3y) + 2=2(y-9)-1
18+9y+2=2y-18-1
20+9y=2y-19
9y-2y=-19-20
7y=-39
y= -39/7

d)9y-5+4y=7y+2y+3
13y-5=9y+3
13y-9y=3+5
4y=8
y= 8/4
y= 2