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3 years ago

8x+3y= 70; y=2 Solve for x.

Mathematics

2 answers:

Fynjy0 [20]3 years ago

8 0

<h3>Explanation</h3>

Given the equation.

$8x + 3y = 70$

with given condition where y = 2.

Therefore, substitute the value of y in the equation.

$8x + 3(2) = 70 \\ 8x + 6 = 70$

Solve the equation for x-term.

$8x = 70 - 6 \\ 8x = 64 \\ x = \frac{64}{8} \longrightarrow \frac{8}{1} \\ x = 8$

Answer Check by substituting the value of y and x in the equation.

$8x + 3y = 70 \\ 8(8) + 3(2) = 70 \\ 64 + 6 = 70 \\ 70 = 70$

Hence, the equation is true for x = 8 and y = 2.

<h3>Answer</h3>

 $\large{x = 8}$ 

Nataliya [291]3 years ago

5 0

Answer:

Step-by-step explanation:

x is 8

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Step-by-step explanation:

Step(i):-

Let 'x' be the length of the rectangle

Given that the width is 3 feet shorter than the length

The width of the rectangle = x -3

Area of the rectangle = length × width

Step(ii):-

Area of the rectangle = length × width

= x ( x-3)

Given that the area of the rectangle = 70 square feet

x ( x-3) = 70

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⇒ x =-7 and x=10

Final answer:-

we choose x=10

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The width of the rectangle (w) = 7 cm

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3 years ago