Question

Use substitution method to solve the equation :
3x + 4 = 7
2x - 3y = -7

Answer 1

Answer:

x=1,y= 3

Step-by-step explanation:

3x=7-4=3

x=3/3=1

x=1

then 2x-3y=-7

put vallue of x

2×1-3y=-7

2-3y=-7

-3y=-7-2=-9

y=-9/-3

y= 3

Answer 2

Answer:

x = 1

y = 3

Step-by-step explanation:

3x + 4 = 7 ....... 1

2x - 3y = -7 ....... 2

From equation 1, we have,

=> 3x + 4 = 7

=> 3x = 7-4

=> 3x = 3

=> x = 3/3

=> x=1 .......3

Now, Substituting equation 3(x=1) in equation 2,

=> 2(1) - 3y = -7

=> 2 - 3y = -7

=> -3y = -7-2

=> -3y = -9 (minus gets cancel) => 3y = 9

=> y = 9/3

=> y = 3

Hence, x = 1 and y = 3.

Hope it helps.............