Solve for x and y- ifi- 15 x-10 y-65ii- 11 x-2 y-45A-x-4 - y-0-5B- x-3 - y-6Cx-3 - y-2Dx-1 - y-5E- Cannot be determined

The correct option is A x = 4; y = 0.515 x +10y = 65 ...... (1) 11x + 2y = 45 ........ (2) (1) × 11 (2) × 15= (165x+11y) (165x+30y) = 715 675 ⇒ 80y = 40 ⇒ ...

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Byju's Answer

Standard IX

Mathematics

General Form of a Linear Equation in Two Variables

Solve for x a...

Question

Solve for x and y, if
i. 15x + 10y = 65
ii. 11x + 2y = 45

x = 4; y = 0.5

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x = 3; y = 6

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x = 3; y = 2

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x = 1; y = 5

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Cannot be determined

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Solution

The correct option is A
x = 4; y = 0.5
15 x +10y = 65 ...... (1)
11x + 2y = 45 ........ (2)
(1) $\times$ 11 - (2) $\times$ 15= (165x+11y) - (165x+30y) = 715-675
$\Rightarrow$ 80y = 40 $\Rightarrow$ y = 0.5
Substituting value of y in either of the equations we get x = 4

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Solve for x and y, if i. 15x + 10y = 65 ii. 11x + 2y = 45

The correct option is A x = 4; y = 0.515 x +10y = 65 ...... (1) 11x + 2y = 45 ........ (2) (1) × 11 - (2) × 15= (165x+11y) - (165x+30y) = 715-675 ⇒ 80y = 40 ⇒ y = 0.5 Substituting value of y in either of the equations we get x = 4

Solve for x and y, if
i. 15x + 10y = 65
ii. 11x + 2y = 45

The correct option is A
x = 4; y = 0.5
15 x +10y = 65 ...... (1)
11x + 2y = 45 ........ (2)
(1) $\times$ 11 - (2) $\times$ 15= (165x+11y) - (165x+30y) = 715-675
$\Rightarrow$ 80y = 40 $\Rightarrow$ y = 0.5
Substituting value of y in either of the equations we get x = 4