Solve the following pairs of linear equations by substitution method.
19. 2x - y = 6: -4x + 2y =3
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-4x + 2y = 3 and 2x - y = 6 .......1
2y = 3 - 4x
y = 3-4x÷2
2x - (3-4x÷2) = 6
2x - 3 + 4x ÷ 2 = 6
(4x - 3 + 4x)÷ 2 = 6
8x - 3 = 12
8x =9
x =9÷8 .....2
now substitute. .......2 in eq .......1
2 × 9÷8 - y = 6
-y = 6 -9÷4
-y = (24-9)÷4
y = -15÷4
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