3F = A+4
In three years Felicia will be F+3 In three years Asare will be A+3
F+3 + A+3 = 30
Simplify, then solve this system of equations by substitution:Simplify Solve the second equation for A Substitute 24-F for A in the first equation Combine like terms on the right Add F to both sides: Substitute 7 for F in Edwin