MathLinear Systems
posted by Sideshow on .
Determine the point of intersection.
(a) y = 4x + 6
y = x + 1
(b) 2x + 5y = 10
x = 10
Please show how to get the point of intersection. thoroughly explain how to get point of intersection.

can someone answer this?

for (a), one method:
y = 4x + 6
y = x + 1
For the standard equation, y = mx + b,
m is the slope. If m is the same for both equations, the lines are the same or parallel. If parallel, the will not intersect. This is not the case here. The lines do intersect.
There are two equations with two unknowns.
Solve for x and y.
One method, eliminate y by substitution, giving:
4x + 6 = x + 1
Solve for x.
Then, substitute that value of x into either equation and solve for y. 
thanks

( 1 , 0 ) POI for (a)
( 10 , 2 ) POI for (b) 
Checking (a) only, (1, 0) is not correct. To check your answer, substitute the values into either equation.
So, y = 4x + 6
substituting your (1,0) answer...
0 = 4(1) + 6
or
0 = 10
which is not equal 
A quick check of your answer for b shows a problem.
The second equation is:
2x + 5y = 10
Substituting the answer (10,2)...
2(10) + 5(2) = 10
or
20 + 10 = 10
Not correct