b. 12
c. 15
d. 18
Answer:
b 12
Step-by-step explanation:
1/(9*24)=1/(x*18)
9*24=18x
x=12
Answer:
b. 12 mens are needed to do that job
Hi Mark
3x+y=4
2x+y=5
Solve 3x+y=4 for y
Add -3x to both sides
3x+y-3x=4-3x
y=-3x+4
Substitute -3x+4 for y in 2x+y=5
2x+y=5
2x-3x+4=5
Simplify both sides of the equation
-x+4=5
Add -4 to both sides
-x+4-4=5-4
-x=1
Divide both sides by -1
-x/-1= 1/-1
x=-1
Substitute -1 for x in y=-3x+4
y=-3x+4
y=(-3)(-1)+4
Simplify both sides of the equation
y=7
Answer: (-1,7)
I hope that's help ! Have a great weekend :)
3x ^2 +20x+12
b) 2%
c) 3%
d) 5%