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

(-1,2)

Step-by-step 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.

= 5

step-by-step explanation:

to find the 15th term substitute n = 15 into the nth term formula

= (- 3 × 15 ) + 50 = - 45 + 50 = 5

-9

step-by-step explanation: