# Solve the followi  Putting these value in given equations, we get

4a + 7b = 2, 2(10a + 14b) = 9

So, the given equations transforms into linear equation in two variables i.e.

4a + 7b = 2… (i)

20a + 28b = 9 …..(ii)

Multiply equation (i) by 4, so

16a + 28b = 8 … (iii)

20a + 28b = 9…..(ii)

Subtract (iii) from (ii),

20a + 28b – 16a – 28b = 9 – 8

4a = 1 Putting above value in (i), 7b = 2 – 1       y + 2 = 7

y = 5

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