Question

11. Lines represented by equations y = 3 and y = -6 are:
(b) perpendicular to each other (b) parallel to each other
coincident lines
(d) none of these
12. The value of c for which the pair of equations cx - y = 2 and 6x - 2y = 3 will have
infinitely many solutions, is
(a) 8
(b) 7
(c) 10
(d) no value can exist
13. One equation of a pair of dependent linear equations is -5x + 7y = 2. The second
equation can be
(a) 10x + 14y + 14 = 0
(b) - 10x - 14y + 4 = 0
(c) - 10x + 14y + 14 = 0
(d) 10x - 14y = -4
14. A pair of linear equations which has a unique solution x = 2, y = -3 is:
x + y = -1, 12x-3y = -5
(b) 2x+15y=5, 4x+10y = -22
(c) 2x-y=17, 3x+2y=12
(d) X-4y-14=0, 5x-y-13 = 0
15. If x = a, y = b is the solution of the equations x - y = 2 and x + y = 4, then the values
of a and b are, respectively.
(a) 2 and 7
(b) 3 and 8
(c) 3 and 1
(d) -7 and 2
B. Short Answer Questions.
1. Solve the following pairs of equations:
(i) + 2 = 4
(ii) 0.2x + 0.3y = 1.3
y
= 4
0.4x + 0.5y = 2.3
ayW
a
*+= a + b
= 2, a, b = 0
b
+
00
a 2
b2
(iv) 2x + 3y + 5 = 0
3
(v)
+
2
Slow
=
-1
3x - 2y - 12 = 0
2xy 3
(vi)
x+y
2
-3
x + y + 0,2x –
10
-
2x-y
y*0
2.
Solve each of the following systems of equations :
(i) ax + by = a - b
(ii) 2(ax - by) + a + 4b = 0
bx - ay = a + b
2(bx + ay) +b - 4a = 0
mx - ny = m² + n2 (iv) +
5
x+y
x + y = 2m
+ = 9
(ii)
57
6
38
X-y
21
x+y
x-y​

Answer 1

Answer:

oh wow ambitious plan to be a great student on brainly

Answer 2

Answer:

I don't now please explain