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.