Question

determine duas solucoes do equacoes: a)5x-4y=9 para:
1)x= -2
2)y=6

b)2x/5 +3y=12 para:
1)x=4
2)y=3/4

Answer 1

a) x = -2
y = 6

5x - 4y = 9
5 × (-2) - 4 × 6 = 9
- 10 - 4 × 6 = 9
- 10 - 24 = 9
- 34 = 9

b) x = 4
y = 3/4

2x/5 + 3y = 12
2 × 4/5 + 3 × 3/4 = 12
8/5 + 9/4 = 12
32/20 + 45/20 = 12
77/20 = 12