Question

Solve the following Systems of Equations by Substitution or Elimination

y = -2x

7x - 8y = -23

(4, -7)

(4, 1)

(-3, 5)

(-1, 2)

Infinite Solutions

No Solution

Answer 1

(-1,2)

Explanation:

y = -2x ______(1)

7x - 8y = -23 ________(2)

Substituting the value of y in eqn.(1) into eqn (2);

7x - 8(-2x) = -23

7x + 16x = -23

23x = -23

x = -1

y = -2(-1) = 2.