to solve the system of equations which expression could be substituted for x into the first equation? first: 2x+7y=10 second: x-2y=15

Question

to solve the system of equations which expression could be substituted for x into the first equation?       first: 2x+7y=10 second: x-2y=15

PsyDAG · Answer

x = 15+2y 2x+7y=10 Substitute 15+2y for x in second equation and solve for y. Insert that value into the first equation and solve for x. Check by inserting both values into the second equation.