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Novay_Z [31]
3 years ago
13

Work out the value of 3x + 2y when x=4 and y=-5

Mathematics
2 answers:
Kruka [31]3 years ago
5 0

3x + 2y =

3*4 + 2*-5=

12 + -10 = 2


Anon25 [30]3 years ago
4 0
Just substitute the equation with the given

The given are 
x = 4 and y = -5
the equation is
3x + 2y
3 (4) + 2 (-5) = 12 - 10 = 2
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-3(5x + 7) + 2x – 3 = 5.x - 8 - 13​
ratelena [41]

Answer:

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Step-by-step explanation:

Simplifying

3(x + -2) = 5x + 8

Reorder the terms:

3(-2 + x) = 5x + 8

(-2 * 3 + x * 3) = 5x + 8

(-6 + 3x) = 5x + 8

Reorder the terms:

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Solving

-6 + 3x = 8 + 5x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-5x' to each side of the equation.

-6 + 3x + -5x = 8 + 5x + -5x

Combine like terms: 3x + -5x = -2x  

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Combine like terms: 5x + -5x = 0

-6 + -2x = 8 + 0

-6 + -2x = 8

Add '6' to each side of the equation.

-6 + 6 + -2x = 8 + 6

Combine like terms: -6 + 6 = 0

0 + -2x = 8 + 6

-2x = 8 + 6

Combine like terms: 8 + 6 = 14

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Divide each side by '-2'.

x = -7

Simplifying

x = -7

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