How do you figure out the slopeee? Explain how. I have a test tomorrow and i am really scared!?

[macaroni]

I know i already asked this question but that was in homework help and no one is answering. so i decided to put it in mathematics section!okayyyy. i'm not sure how to figure out the slope of equationss. here's an example i got from my book can you explain how you got the answer you got. i swear i am not looking for answers for my homework. i'm just not sure how to do it and i have a test tommorow!heres the directions:Find the coordinates of 2 points on the line with the given equation. Then use the points to find the slope of the line.y=2x+4here's another one i don't understand hwo to do.y=-1and another:x=3do whichever. try not to do a one thats already answered unless the person answered it wrong.

[loliver0322]

i don't know the answers but slope=rise/run or y/x

[TheBitchSister]

y=-1 is a y-line which means it has a slope of 0.------------------------ <--a y-linex=3 is a x-line which means it has undefined slope | | <--a x-line | | when you see y=(any #) with x nowhere in sight, the slope is 0when you see x=(any #) with y nowhere in sight, the slope in undefinedAs for the equation you can cheat a little. What they gave you is a slope-intercept equation, meaning that its format is this: y=mx+bAs you might already know, m is the slope, so in y=2x+4 the slope is 2.

[E5432]

The first one: the slope is 2. whatever is with the x is the slope.the second is undefined b/c its straight up and downand the third is zero since its a straight line

[Panjam]

The slope is the value of m in the general equation y=mx + bSo, in the example the slope, m would be 2To find two coordinates just plug in a value of x and you will get the y value. For example when x=0, y=2(0) + 4 = 4. So (0,4) is one coordinate.The other two are just straight lines, so there slope is 0, and a coordinate could be anywhere on the line. For example in y=-1, (x,-1) where x can be any number is a coordinate

[vivekachary1450]

let (x1,y1) and (x2,y2) be the two pointsthen the slope is (y2-y1) / (x2-x1)y=2x+4just put any simple value of x and find out the value of yso say x=0then y = 2*0 + 4 = 4so (0,4) becomes your (x1,y1) now try x=1so y = 2*1 + 4 = 6so (1,6) becomes (x2,y2)so the slope is (6-4) / (1-0) = 2/1 = 2y=-1here the value of y is fixedthat means y1 = -1 y2 = -1 alsoso here slope = (y2-y1) / (x2-x1) = 0 / (x2-x1) = 0(zero slope means it is a flat/ horizontal line, parallel to x-axis)x=3here the value of x is fixedthat means x1 = 3x2 = 3 alsoso here slope = (y2-y1) / (x2-x1) = (y2-y1) / 0 = infinity(infinite slope means it is a vertical line, parallel to y-axis)

[Pointy3018]

<< Find the coordinates of 2 points on the line with the given equation. Then use the points to find the slope of the line.y=2x+4 >>The coordinates of any point on the line should always satisfy the above given equation.To get two points, set x = 0 and x = 1 to get the corresponding values of y.For x = 0, y = 2(0) + 4 = 4For x = 1, y = 2(1) + 4 = 6So, your two points are as follows: (0,4) and (1,7)Slope of a line = m = delta y/delta x ORm = change in y-values/change in x-valuesTherefore, from the 2 points above, the slope ism = (6 - 4)/(1 - 0) = 2Slope = m = 2IMPORTANT NOTE: The general form of the equation of a straight line isy = mx + bwherem = slopeb = y-intercept (this is where the line crosses the y-axis)Compare your given equation,y = 2x + 4to the general form of a straight line equationy = mx + band note that m = 2 (which is the same value obtained using the 2 points determined above) and b =4.<< here's another one i don't understand hwo to do.y=-1 >>Go back to the definition of the slope which ism = delta y/delta xNote that y = -1 is a horizontal line and since sincd the value of y does not change (delta y = 0),m = slope = 0. << and another:x=3 >>slope = delta y/delta xWhen x = 3 (constant), then delta x = 0 (x does not change) and since slopem = delta y/0the slope is undefined since division by zero occurs.