Question

16. Use substitution to solve for x and y: (4x+y=25, x-3y=-10

Answer 1

Answer:

y = 5  

x = 5

Step-by-step explanation:

first find y =

y = -4x + 25

substitute it

x - 3(-4x +25) = -10

x + 12x - 75 = -10

13x = 65

x = 65/13

x = 5

y = -4(5) + 25

y = -20 +25

y = 5

check your answers

4(5) + (5) =25

20 + 5 =25

25 = 25  correct

and

(5) - 3(5) = -10

5 - 15 = -10

-10 = -10 correct