Question

resolva os sistemas x²+y²=10 2x+y=7

Answer 1

y=7-2x

x²+(7-2x)²=10

x²+49-4x²=10

-3x²=10-49

(-1).-3x²=-39.(-1)

3x²=39

x²=39/3

x²= 13

x= raíz de 13