Question

x^2-y^2=39
x=7-3y
simultaneous equations​

Answer 1

Answer:

x^2-y^2=39

x=7-3y

(7-3y)^2-y^2=39

49+9y^2-28y-y^2=39

8y^2+21=39

8y^2=18

y^2=2.25

y=+-1.5

Answer 2

explanation: hope the image helps