Answer:
ONE SOLUTION
Step-by-step explanation:
When two points on a line are given, the equation of the line is given by the formula:

where
and
are the points on the line.
Here, the first set of points are:
and
.
Therefore,
and
.
The line passing through this is given by:


∴ 2x + y - 1 =0
Now, for the second line, the points are:
and
.
Therefore, 

∴ 2x - y + 2 = 0
Now, to determine the number of solutions the two equations have, we solve these two equations,
Adding Eqn(1) and Eqn(2) we get:
4x = -1

And
.
Since, we arrive at unique values of 'x' and 'y', we say the lines have only one unique solution.
$5 each car
3 hours = 12 cars
÷3 ÷3
1 hours = 4 cars
×8 ×8
8 hours = 32 cars
32 cars × $5 per car =
$160
They earned $160 in 8 hours, from washing 32 cars.
Answer:
$20
Step-by-step explanation:
multiply 100.00 x 5% which is 100x 0.05, then it will give you 5.
add 5, 4 more times which will give you 20
The two square roots are 20 and -20