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Daniel [21]
3 years ago
9

-3x-4y=-12 Need to find the slope and y-intercept

Mathematics
2 answers:
Rama09 [41]3 years ago
8 0
For this you want to put it into slope-intercept form: y=mx+b


-3x-4y=-12
add over -3x
-4y=3x-12
divide by -4
y=-3/4x + 3  (now it's in the right form!)

The slope is m (-3/4)
and the y intercept is b (3)
CaHeK987 [17]3 years ago
5 0
In form
ax+by=c
slope=-a/b
y intercpept=c/b

so

-3x-4y=-12
a=-3
b=-4
c=-12
slope=-(-3)/-4=3/-4=-3/4
yint=-12/-4=3

slope=-3/4
yint is 3
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Answer:

B, E

Step-by-step explanation:

The equation of that line in slope intercept form is y = -2/5x + 2

The slope of a line parallel to that line will be the same as its slope, so -2/5.

To find the y-intercept of a line that passes through the point (-5, 1) with that slope, you will have to plug in the x and y values of that point into what you know of the equation of the line.

y = -2/5x + b

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From this, you can construct an equation.

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However, this is not an answer choice.  

It cannot be A because this line does not have a slope of -1.

2x + 5y = 15

5y = -2x - 5

y = -2/5x - 1

It can be B because this line is the same as the equation we came up with.

It cannot be C because this line does not have a slope of -1 or a y-intercept of -3.

2x + 5y = -15

5y = -2x - 15

y = -2/5x - 3

It cannot be D because this line does not have a y-intercept of -3.

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y - 1 = -2/5x - 2

y = -2/5x - 1

It can be E because this equation matches the one we came up with.

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