use the method of substitution to solve the following pairs of simultaneous equations 1. y = 2x-4 and 3x+y=11

x=3 and y=2

Step-by-step explanation:

first you rearranging the values

2x - y = 4 (i

3x + y = 11 (ii)

make y the subject of formular from ii

y=11 - 3x (iii

substitutes equ. (iii) into (i)

2x - (11-3x) = 4

2x - 11 + 3x = 4

5x = 15

x = 3

substituting x into equ. (iii) we have:

y = 11 - 3(3)

y = 11 - 9

y = 2

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

$3,200 x 7.25% = $3,200 x .0725 = $232 interest monthly

$232 monthly x 12 annual = $2, 784

step-by-step explanation: