solve each system of equation by using a table

Question

1. y=3x-4
y=-2x+11

2. 4x-y=1
5x+2y=24

how do you do these?

Answer 1

solve each system of equation by grpahing

3. y=-3x+6
2y=10x-36



4. y=-x-9
3y=5x+5

Answer 2

for #1, it's easy to substitute. You have two values for y, so set them equal.

3x-4 = -2x+11
5x = 15
x = 3
so, y=3x-4 = 5

For #2,
4x-y=1, so y=4x-1
Plug that in, and we have
5x+2y = 5x+2(4x-1) = 24
5x+8x-2 = 24
13x = 26
x = 2
so, y = 4x-1 = 7

There are lots of graphing sites. Try this one, which allows you to plot up to three functions on the same axes:

http://rechneronline.de/function-graphs/

Answer 3

y=3x-4 = 5

how did you get that

i don'tunderstand

Answer 4

really?
If x = 3, y=3*3-4 = 5

Answer 5

ohhh ok