Maths Watch
Solve the simuntaneous equestions
2x + 3y = 13
4x -y=-2

Step-by-step explanation:

2x + 3y = 13     (i)

4x -y  = -2  (ii)

(i)           2x + 3y = 13

(ii)*3     12x - 3y = -6       {multiply(ii) by 3}

add,      14x         =  7

                        x = 7/14 = 1/2 = 0.5

                        x = 0.5

Put x = 0.5 in (i)

2*0.5 + 3y = 13

      1 + 3 y = 13

           3y = 13-1

          3y = 12

            y = 12/3

y= 4

one solution : (1/2 ; 4)

Step-by-step explanation:

hello :

2x + 3y = 13 (*)

4x -y=-2(**)

by (**) : y = 4x+2

put this value in (*) : 2x+3(4x+2) =13

2x+12x+6 = 13

14x =7

x=7/14 so: x= 1/2

but : y = 4x+2

y = 4(1/2)+2

y = 4

one solution : (1/2 ; 4)

rx and sx

step-by-step explanation:

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40