Question

I have 3 math questions please help 30 points c:

1: What is the value of y so that the ordered pair (2, y) is a solution to the equation 2x + y = -2 ?
A.–6
B.–2
C. -1/2
D.0



Joe earned $400 doing yard work this week. He charged $20 to mow a lawn and $10 to weed a garden. The equation 20m + 10w = 400 represents how much work Joe did this week, where m is the number of lawns Joe mowed and w is the number of gardens he weeded.

Which variable is the independent variable?

A.m
B.w
C.There is no relationship between the variables.



Movie tickets cost $5 per child and $9 per adult. The equation to find the total cost of the movie tickets is t = 5n + 9a , where n is the number of children, a is the number of adults, and t is the total cost.

Which variable is the dependent variable?



A.a
B.n
C.t
D.There is no relationship between the variables.

Answer 1

1)
2x+y=-2
(2,y) then: x=2
Therefore:
2(2)+y=-2
4+y=-2
y=-2-4
y=-6

answer: A. -6

2)
answer: C. there is not relationship between the variables

3)
Answer: C.t