Question

alguem resolve essa por favor

Answer 1

ax + 2y = -1
3x + by = 3

2x + y = 1
x - y = -4 ou  x = -4 + y ***
2( -4 + y) + y = 1
-8 + 2y  +  y = 1
3y = 1 + 8 
3y = 9
y =   3 ****

x = -4 + y
x = -4 + 3
x = -1 ******

-1a + 2(3) = -1
-a + 6 = -1
-a = -1 - 6
-a = -7
a = 7  *****

3x + by = 3
3(-1) + 3b = 3
-3 + 3b = 3
3b = 3 + 3
3b = 6
b = 6/3 = 2 ****
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a + b = 7 + 2 = 9 **** ( b )