Question

me ajudem pelo amor de deus valendo 10 pontos,e para hj a noite. e a (b),(c),(d).

Answer 1

4x + 5y = -21 (2)
7x - 2y = 17 (5)
-------------------------
8x + 10y = -42
35x - 10y = 85
-------------------------
43x = 43
x = 43/43
x = 1

7x - 2y = 17
7(1) - 2y = 17
7 - 2y = 17
-2y = 17 - 7
-2y = 10
y = -10/2
y = -5

==============================================

3a + 5b = -8 (5)
5a - 3b = 32 (-3)
-------------------------
15a + 25b = -40
-15a + 9b = -96
-------------------------
34b = -136
b = -136/34
b = -4

5a - 3b = 32
5a - 3(-4) = 32
5a + 12 = 32
5a = 32 - 12
5a = 20
a = 20/5
a = 4

====================================================

2p + 11q = 5 (7)
7p - 3q = -24 (-2)
---------------------------
14p + 77q = 35
-14p + 6q = 48
---------------------------
83q = 83
q = 83/83
q = 1

2p + 11q = 5
2p + 11(1) = 5
2p + 11 = 5
2p = 5 - 11
2p = -6
p = -6/2
p = -3

==========================================================

9m + 6n = -12 (4)
4m - 5n = 10 (-9)
-------------------------------
36m + 24n = -48
-36m + 45n = -90
-------------------------------
69n = -138
n = -138/69
n = -2

4m - 5n = 10
4m - 5(-2) = 10
4m + 10 = 10
4m = 10 - 10
4m = 0
m = 0/4
m = 0

BONS ESTUDOS!