Question

x3+1=715

Solve for x
Answer
$x + y = 5 \\ 2x - 3y = 4$

Answer 1

multiple with 2
the first equation
x+y=5.......(1)
2x-3y=4.......(2)
we get the equation
2x+2y=10
2x-3y=4
adding equation 1 and 2 by changing its signs
we get

y=6/5
substitute the value of y in the equation
we get x= 43/5