Question

Solve the following simultaneous equations using an appropriate method.

Answer 1

Good evening ,

Look at the photo below for the answer.

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Answer 2

Answer:

a) x = 1 , y = 3

Step-by-step explanation:

a) 7x + 3y = 16

y = 4x - 1

or

3y + 7x = 16 ... (i)

y - 4x = -1 ... (ii)

Solving the simultaneous equation by substitution;

Equation (ii) tells us that y = 4x - 1

Substituting that in (i) gives;

3(4x - 1) + 7x = 16

12x - 3 + 7x = 16

19x = 16 + 3 = 19

x = $\frac{19}{19}$ = 1

y = 4(1) - 1 = 3