Question

I need help with these substitution problems..and how to graph them! MEDALS WILL BE GIVEN

1) y=4x-6
when y=2x-4
(x ,y )

2) y+2x=1
when y=3x+6
(x ,y )

3) y=x+10
when y=-2x
(x ,y )

4) y= -x+9
when y= -3x
(x ,y )

Answer 1

A solution could not be calculated.

Answer 2

where they both meet, they can

Answer 3

@freakenpurplepizza see? It can be calculated.. I just understand this!

Answer 4

I will do the first one, you can follow the same procedure for the rest:
1)
y = 4x - 6 (1)
y = 2x - 4 (2)
Replace y with 4x - 6 in (2)
4x - 6 = 2x - 4
4x - 2x = 6 - 4
2x = 2
x = 1
Put x = 1 in (1)
y = 4(1) - 6 = -2

So (1,-2) is the solution.

For graphing y = 4x - 6, find where the graph cuts the x and y axes (that is, the x and y intercepts):
To find the x-intercept, set y = 0 and solve for x: 0 = 4x - 6
4x = 6
x = 1.5

To find the y-intercept, set x = 0 and solve for y: y = 4(0) - 6 = -6

Mark off 1.5 on the x-axis and -6 on the y-axis and draw a line passing through the two pints using a ruler.

Answer 5

That makes sense! Alrighty I will follow this procedure and will read this over.. Thank you

Answer 6

You are welcome.