Question

Me ajudem com esse sistemas pfv
a) {3a+30b=100
-21a-30b=80
b) {2x+3y=10
-x+5y=60

Answer 1

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Ola Gabriel

3a + 30b = 100
-21a - 30b = 80

-18a = 180
a = -180/18 = -10

-30 + 30b = 100
30b = 130
b = 130/30 = 13/3

2x + 3ÿ = 10
-x + 5y = 60
-2x + 10y = 120

13y = 130
y = 10

2x + 30 = 10
2x = -20
x = -10

pronto