Answer:
,
,
,
, 
Step-by-step explanation:
First question:
He starts with 18, gains 2 every week, and needs 42. This means the equation is
.
Second question:
He starts with 2, gains 18 every week, and needs 42. This means the equation is
.
Third question:
It starts with 42, loses 2 every day, and needs 18. This means the equation is
.
Fourth question:
Each friend has a total bill of 18+x, there are 2 friends, and they need 42. This means the equation is
.
The only answer left is
, so that's the answer to the fifth problem.
Answer:
C
Step-by-step explanation:
standard form is ax + by = c, which is true for the third option.
Step-by-step explanation:
m=y²-y¹/x²-x¹
m=5-1/7-1
m=4/6
m= 2/3
The slope is 2/3
-4r-11=4r+21
Move 4r to the other side
Sign changes from +4r to -4r
-4r-4r-11=4r-4r+21
-4r-4r-11=21
-8r-11=21
Move -11 to the other side
Sign changes from -11 to +11
-8r-11+11=21+11
-8r=21+11
-8r=32
Divide both sides by -8
-8r/-8=32/-8
Answer: r=-4