Question

please solve this problems please solve I will follow you please help me guys ​

Answer 1

1) 4x + 5y =19

x=1 ;

4(1)+5y=19

4+5y=19

5y=19-4

5y=15

y=15/5

y=3

(b) 3

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2)

b) x(x+5)=2

x²+5x=2

x²+5x-2=0 is a quadratic Equation

(b) x(x+5)=2

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3) Sum of first 30 natural numbers;

AP = 1,2,3,4,...,30

a=1

d=1

Sn=n/2[2a+(n-1)d]

S30 = 30/2[2(1)+(29)1]

= 15[2+29]

=15(31)

=465

(b)465

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4)

AP = 15, 10 , 5,...

a=15 ; d=(-5)

Sn = n/2 [2a+(n-1)d]

S10 = 10/2 [2(15)+(10-1)(-5)]

= 5 [30+(9)(-5)]

=5[30+(-45)]

=5(-15)

=(-75)

(a) (-75)

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