Question

d-x/2+ 4y = 18
- 4x + 5y = -30​

Answer 1

X=21

Y=21

Explicação passo-a-passo:

d-x/2+4y=18 (5) 10+20y=90

-4x+5y=-30 (4)

____________ 0x+20y=120

____________

10x+40y=210

210÷10=21

21÷21=21

X=21

Y=21