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Question (41)

QN009029

A telecom recharge balance decreases by ₹15 daily from ₹600. After how many days will the balance become zero?

(A) 35
(B) 38
(C) 40
(D) 45

Correct Answer: C

Explanation:

600−15x=0⇒x=40

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Question (42)

QN009030

A student’s internet bill follows y=ax+b. If y=350 when x=10 and y=550 when x=20, the value of a is:

(A) 10
(B) 15
(C) 20
(D) 25

Correct Answer: C

Explanation:

550−350=200 and 20−10=10, so a=200/10=20

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Question (43)

QN009031

In the same internet bill problem, the value of b is:

(A) 100
(B) 120
(C) 150
(D) 200

Correct Answer: C

Explanation:

350=20(10)+b⇒b=150

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Question (44)

QN009032

Which point lies on the line y=2x+1?

(A) (1, 3)
(B) (2, 5)
(C) (3, 7)
(D) All of these

Correct Answer: D

Explanation:

Each point satisfies y=2x+1

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Question (45)

QN009033

Which equation represents a line with negative slope?

(A) y=3x
(B) y=2x+1
(C) y=−x
(D) y= 2 x

Correct Answer: C

Explanation:

Negative coefficient of x gives negative slope.

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Question (46)

QN009034

The y-intercept of the line y=3x−2 is:

(A) –3
(B) –2
(C) 2
(D) 3

Correct Answer: B

Explanation:

In y=ax+b, y-intercept is b.

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Question (47)

QN009035

Lines with equal slopes and different y-intercepts are always:

(A) perpendicular
(B) intersecting
(C) parallel
(D) curved

Correct Answer: C

Explanation:

Parallel lines have same slope.

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Question (48)

QN009036

Which graph is steeper among the following?

(A) y= 2 1 x
(B) y=x
(C) y=2x
(D) All are equally steep

Correct Answer: C

Explanation:

Greater slope means steeper line.

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Question (49)

QN009037

If the slope of a line is positive, it represents:

(A) linear decay
(B) constant polynomial
(C) linear growth
(D) quadratic growth

Correct Answer: C

Explanation:

Positive slope indicates increase.

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Question (50)

QN009038

The graph of every linear equation is a:

(A) parabola
(B) circle
(C) straight line
(D) curve

Correct Answer: C

Explanation:

Linear equations always form straight lines.

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Question (41)

A telecom recharge balance decreases by ₹15 daily from ₹600. After how many days will the balance become zero?

Explanation:

Link:

Question (42)

A student’s internet bill follows y=ax+b. If y=350 when x=10 and y=550 when x=20, the value of a is:

Explanation:

Link:

Question (43)

In the same internet bill problem, the value of b is:

Explanation:

Link:

Question (44)

Which point lies on the line y=2x+1?

Explanation:

Link:

Question (45)

Which equation represents a line with negative slope?

Explanation:

Link:

Question (46)

The y-intercept of the line y=3x−2 is:

Explanation:

Link:

Question (47)

Lines with equal slopes and different y-intercepts are always:

Explanation:

Link:

Question (48)

Which graph is steeper among the following?

Explanation:

Link:

Question (49)

If the slope of a line is positive, it represents:

Explanation:

Link:

Question (50)

The graph of every linear equation is a:

Explanation:

Link:

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