A. Two variables exhibit direct variation if they have a constant ratio
Bob can do a tenth of the roof in an hour
James can do a sixteenth in an hour
Bob can do 16/160 of the roof in an hour
James can do 10/160 of the roof in an hour
Together they do 26/160 of the roof in an hour
160/26 = 6.15 (to 2 d.p.)
Slimination
multiply first equaiton by 2
2x+6y=10
add to second equiaotn
2x-2x+6y-6y=10-10
0=0
this is true so therfor they are the same equaiton
so solve
x+3y=5
3y=-x+5
y=-1/3x+5/3
subsituter values for x and get valuse for y
if x=2 then y=1
Answer:
14) equilateral triangle
15) right triangle
16) equilateral triangle
Step-by-step explanation:
14) equilateral triangle
15) right triangle
16) equilateral triangle
Desmos graphing works for me