Posted by jason on .
i don't know how to slove the/A system by using substitution
3x+4Y=9
y=x3

Algebra 
PsyDAG,
y = x3
3x + 4y = 9
Substitute x3 for y in second equation and solve for x. Insert that value into the first equation and solve for y. Check by inserting both values into the second equation.