Question

simultaneous equations graphically 3x-4y=-7;5x-2y=0

Answer 1

3x-4y=-7 ..... equation1
5x-2y=0 ...... equation 2
equation 1-2*2
3x-4y=-7
10x-4y=0
- +
_______
-7y =-7
y = 1
so
3x-4(1)=-7
3x=-7+4
x =-1

Answer 2

$hi ......$
$3x - 4y = - 7.................(1)$
$5x - 2y = 0....................(2)$

[ Multiplying equation no. (2) by 2]

$we \: \: get........$

$10x - 4y = 0...................(3)$

[Subtracting equation no. (3) from (1)]

$3x - 4y = - 7$
$10x - 4y = 0$
____________
$- 7x = - 7$
$7x = 7$
$x = \frac{7}{7}$
$x = 1$

[Substitute x = 1 in equation no. (2)]

5x - 2y = 0

5(1) - 2y = 0

5 - 2y = 0

5 = 2y

y = 5 / 2

y = 2.5
_________________________
Solution :
$x = 1 \: \: . \: \: y = 2.5$
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$hope \: this \: helps.........$