Question

4. Using the substitution method, solve each of the following pairs of simultaneous equations. (c) 2x - 7y = 5 3x + y = -4​

Answer 1

Answer:

2x - 7y = 5------------- 1

3x + y = -4-------------2

Taking the eq 1 .

=>2x - 7y = 5.

=>2x=7y-5.

=>x= 7y-5/2.

Substituting the value of x in eq 2.

=>2(7y-5/2)-7y=5.

=> 14y-10/2-7y=5.

=> 14y-10-14y=5.

=> -10+14y-14y=5.

=> -10+y=5.

=> y= 5/10

=> y= 2

Substituting the value of y in eq 1.

=>2x- 7×2= 5.

=> 2x-14=5.

=> 2x= 14-5.

=> 2x= 9.

=> x= 9/2.

The value of x is 9/2 and y is 2.

Step-by-step explanation:

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