Question

Solve 2x-3y=13 and 7x-2y=20 and hence fimd the value of m for which y =mx +7

Answer 1

Answer:

2x-3y=13 eq(1)

7x-2y=20 eq(2)

from eq(1) we get x = ( 13 + 3y ) / 2 eq(3)

now from eq(2) and eq(3)

7 * (( 13 + 3y ) / 2) - 2y = 20

91 + 21y - 4y = 40

17y = -51

y = -3

now from eq(3)

x = ( 13 - 9 ) / 2

x = 2

so now put the value of x and y in y =mx +7 and we get

-3 = 2m + 7

m = -5

Step-by-step explanation: