Yx3-4 part 1 joe y-20 like part 1 part2 how 5×3-4=11years old mike part 2 is 5-20=15years to find joes age I used the equation from part 1 and replaced the ys with 5 also with mike i did the same part 3 Sally would be 15 years old i solved this by looking back a part 2 at mikes age and the equation would be 20-5=15 15=y y= sallys age
