Mathematics, 13.03.2020 02:24 shouyuanroh8462

I’ve been at this for 3 hours. Please help. I’m going to fail math class.

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Answer from: R3nNyx

1: Slope = 1/2 y-intercept = -3

2: Slope = -3 y- intercept = 2

3: Slope = -2 y-intercept = -3

Step-by-step explanation:

The slope is the " M" in Y=Mx+b

The y intercept is the b. you can re-arrange things in the problem to get it into this format. This is always easiest for me.

Answer from: Andy10201

1. y=1/2x-3

Before solving, memorize this formula:

y=mx+b

m=slope

b= y intercept

Therefore, the slope would be 1/2. The y intercept would be -3.

2. 3x+y=2 We have to find out what y is. to do this we havhave to get y by itself:

3x-3x+y=2-3x Subtract 3x from 3x and 2.

y=2-3x or y=-3x+2

The slope is -3. The y intercept is 2.

3. 2x-y=3 Again, same as 2.:

2x-2x-y=3-2x Subtract 2x.

-y=3-2x y cant be negative. For y to be positive, you have to divide by -y(-1):

-y/-y=3-2x/-y

y= -3y+2x

Slope is -3. y intercept is 2.

For the graphs:

1. y=1/2x-3

y intercept is what y equals in (x,y) when x=0. for example: y=1/2x-3

y=1/2(0)-3

y=-3

this is why you wouldplot your first point on(0,3). Remember, x goes left to right horizontally while y goes up and down vertically. Now, you'll use the slope: 1/2

1/2=y/x From the point you'll go up one unit, since y=1. Then, go right 2 units since x=2. This is your second point: (2,-2)

One more tip: When a slope is negative (i.e. -1/4), Only y is negative. So when y is negative you go down by units instead of going up.

I hope that this is enough to help you graph 2. and 3. on your own

Answer from: Quest

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