Answer:
The equation is
whose solution is 
Step-by-step explanation:
Let us call
the number of minutes the phone is used over 200 minutes, then we have
<em>(this says monthly bill of $40 plus the cost of phone usage over 200 minutes must equal $58 )</em>
This equation can be used to solve for
u as follows:



Answer:
y = 7x
Step-by-step explanation:
The equation of a line passing through the origin is
y = mx ( m is the slope )
Calculate m using the slope formula
m = 
with (x₁, y₁ ) = (0, 0 ) and (x₂, y₂ ) = (100, 700 ) ← 2 points on the line
m =
=
= 7
y = 7 x ← equation of line
Answer:zero 9
Step-by-step explanation:
Answer:
1x+3x=200
4x=200
x=50
1x=50 x=50
4(50)=150
then the answer is 50 and 150