Question

eQUAÇÕES DO 1 GRAU SENDO U=Q
13-7X=17
4(X-2)-2(X-1)=4
8(10-M)=5(M+3)
3(1-Y)-2(Y+1)=9(Y-1)+3

Answer 1

a)
13 - 7x = 17
13 - 17 = 7x
- 4 = 7x
7x = - 4
x = - 4/7
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b)
4(x - 2) - 2(x - 1) = 4
4x - 8 - 2x + 2 = 4
4x - 2x - 8 + 2 = 4
2x - 6 = 4
2x = 4 + 6
2x = 10
x = 10/2
x = 5
**********************************
c)

8(10 - M) = 5(M + 3)
80 - 8m = 5m + 15
80 - 15 = 5m + 8m
65 = 13m
13m = 65
m = 65/13
m = 5
****************************************
d)

3(1 - Y) - 2(Y+1) = 9(Y - 1) + 3
3 - 3y - 2y - 2 = 9y - 9 + 3
3 - 5y - 2 = 9y - 6
- 5y + 1 = 9y - 6
1 + 6 = 9y + 5y
7 = 14y
14y = 7
y = 7/14
y =   7  (:7)         1
      ------       =  ------
       14  (:7)        2

y = 1/2