I have no clue how to solve this
Solve by graphing
Plot the line y=x+2, the on the same axes plot the line y=4-x.Originally Posted by josh_c
The solution is the point at which the two lines cross, as this is
a point where the x and y values satisfy both equations, and hence
is the required solution.
you've got to take a nice piece of paper and trace the lines (i dont know if its a proper expression) that are related to your two equation
The solution should be the coordonates (x,y) of the intersection of those two lines so handle your rule corectly and dont shiver!
You dont know how to trace a "line" related to an linear equation?
if you know to trace a line when youve got two points of the line i will tell you:
ax+b=y is the general form of a linear equation
so when you fix x you should know how to calculate y (if you dont give me your account number and your telephon number i will show you a trick)
so you choose two x for which the point (x,y) (or (x,ax+b) if you preffer) are easy to plot on you piece of paper and there you go
Look at the point at which the lines intersect. This point has an x-coordinateOriginally Posted by josh_c
call this and a y-coordinate call this .
Then the solution is and .
To check that this is a solution plug these values back into the equations
and you should find that they balance.
re re hi
so you want to understand what you are doing (take care this is no politicaly correct)
When you plot a line (satisfying a linear equation) you plot on your paper
all (a part indeed) the point which coordonates satisfy the equation
why that? i have to think of it a few minuts to it (may be more)
So you plot all the point satisfying equation 1
and all the plot satisfying equation 2
So if there is a point that satisfy the two equation it is the intersection of this two line you surely will understand why (you just have to say this point ...ect)
if you know some litle basis of geometry you know that two unparralell line have only one intersection and that two parrallel line are the same line or have no intersection
for the more tricky question wait a few minute
or watch your boock
re re By!