Evaluate the expression: 5x – y when x = -4 and y= -2 marked as brainliest :)

Mathematics

1 answer:

sp2606 [1]3 years ago

7 0

It's a good idea to get into the habit of

using parenthses when substituting

numbers in for variables.

Since x = -4 and y = -2, 5x - y is 5(-4) - (-2).

Now, 5(-4) is -20 and minus a negative 2

can be thought of as plus a positive 2.

So we have (-20) + (+2) which equals -18.

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Marta_Voda [28]

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3 years ago

write an equation in slope intercept form for the line that is perpendicular to y=-1/4x+2 and passes through the points (-4,3)

PilotLPTM [1.2K]

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m1*m2=-1, and in this case:

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-m=-4

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3 years ago

jekas [21]

Answer:

b= -8

Step-by-step explanation:

we have: 3y +12 = 6x <=> y + 4 = 2x <=> y= 2x - 4

=> 2y=4x + b

<=> 2(2x-4) = 4x +b

<=> 4x - 8= 4x +b

<=> b = -8

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