Question

i really cant understand this
please help

Answer 1

@Directrix @fantageplayer

Answer 2

@AloneS @Alienium

Answer 3

You should graph the functions, but first it should be helpful to rewrite the equations in this way,\[b=2a-4\]
\[b=a/2+2\]

Answer 4

just give -1, -0.5, 0, 0,5, 1 values to the equation and plot the points
and give some values to the second equation
the intersection points of two graphs are the solution

Answer 5

what would i do

Answer 6

@Alienium

Answer 7

just calculate the results for each point i gave you in the first equation, match teh points with the results and draw the first graph
then the same numbers put them in the second equation and find the results, match the points with the results and draw the second graph, and the points of intersection of the two graphs form the solution of the problem

Answer 8

i dont know :(
did you understand the question @Alienium

Answer 9

so....
the thing is
you have to solve the equations with the graph method, this is just making visible what the equation represents
to do that we are going to give each of the equations some values to build each graph, and the intersection points of two graphs are the coordinates for the solution of the system

so we take the x points of: -1, -0.5, 0, 0.5, 1, and substitute each in place of a in the first equation
we match the results to the x points such as, substitute a=-1 b=(value after calculation)
so we get 5 (a:b) coordinates from the first equation, enough to build the first graph

repeat the same in the second equation and get the coordinates, build the second graph

see the points where the two graphs intersect, get their x/y coordinates, they will make the solution coordinates for the whole system

Answer 10

forgot to mention, if the two graphs intersect at all, there is, one or two solutions based on how many intersection points are, and if the two graphs match perfectly, there are infinite solutions, if the graphs don't intersect at all, there are no solutions