Question 926799
19) let x be the ones digit and y be the tens digit, then
y = x +6
20) let x be the tens digit and y be the ones digit, then
y = x -4
21) let l be the length and w be the width, then
l = (1/2)*5w
Perimeter(P) = 2*((1/2*5w) + 2w
2P = 10w + 4w
P = 5w +2w = 7w
22) let x be the shortest base and y be the longer base, then
y = 2x + 3
sum of the bases = x + 2x +3 = 3x +3