100 somebody answer! but it has to correct!
x-7y=4
-3x+21y=5

what is the solution to the system of equations above?
what do you know about the two lines in the system of equations?

If a =6, what is the value of 2a(3b + 5c)?

Consider the function represented by the equation 1/2 j + 1/4 k equals 3 which shows the equation written in function notation with j as the independent variable

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?