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2 years ago

15

How do I solve 3x-7y=63 and 4x+3y=-27by addition?

1 answer:

blagie [28]2 years ago

5 0

Multiply eqn 1 by 3 and eqn 2 by 7 then adding them will cancel Y. and X can be found.

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Write a 4 -digit number that is divisible by both 5 and 9

vodomira [7]

4500 is both divisible by 5 and 9
4500/9=500
4500/5=900

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3 years ago

During a big race, Jeff races his car at a rate of 125 miles per hour for 3.2 hours. What is the distance of the race?

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2 years ago

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nadya68 [22]

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3 years ago

The table shows a linear function. <br><br> Which equation represents the function.

mote1985 [20]

Answer:

$\large\boxed{f(x)=\dfrac{3}{2}x-1}$

Step-by-step explanation:

$\text{The slope-intercept formula:}\\\\y=mx+b\\\\m\ -\ slope\\b\ -\ y-intercept\\\\\text{The formula of a slope:}\\\\m=\dfrac{y_2-y_1}{x_2-x_1}\\\\\text{From the table we hve two points (0, -1) and (2, 2). Substitute:}\\\\m=\dfrac{2-(-1)}{2-0}=\dfrac{3}{2}$

$\text{Therefore the equation is}\ f(x)=\dfrac{3}{2}x-1\\\\\text{Check for the point (4, 5):}\\\\f(4)=\dfrac{3}{2}(4)-1=(3)(2)-1=6-1=5\qquad\ CORRECT$

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3 years ago

What is 6x^2-x-2 when factoring

lidiya [134]

6x^2-x-2 this is of the form ax^2+bx+c

jk=ac=-12 and j+k=b=-1 so j and k must be -4 and 3 so

6x^2+3x-4x-2

3x(2x+1)-2(2x+1)

(3x-2)(2x+1)

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3 years ago